Add OSSF Scorecard badge

[ognevsd]

Adding an OSSF scorecard badge can show that ghostty follows security best practices and also is transparent about the project's security

Current scorecard:
Aggregate score: 5.9 / 10

Check scores:
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| SCORE | NAME | REASON | DOCUMENTATION/REMEDIATION |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | Binary-Artifacts | no binaries found in the repo | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#binary-artifacts |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 3 / 10 | Branch-Protection | branch protection is not | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#branch-protection |
| | | maximal on development and all | |
| | | release branches | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | CI-Tests | 14 out of 14 merged PRs | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#ci-tests |
| | | checked by a CI test -- score | |
| | | normalized to 10 | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | CII-Best-Practices | no effort to earn an OpenSSF | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#cii-best-practices |
| | | best practices badge detected | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 7 / 10 | Code-Review | Found 10/14 approved | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#code-review |
| | | changesets -- score normalized | |
| | | to 7 | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | Contributors | project has 37 contributing | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#contributors |
| | | companies or organizations | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | Dangerous-Workflow | no dangerous workflow patterns | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#dangerous-workflow |
| | | detected | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | Dependency-Update-Tool | update tool detected | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#dependency-update-tool |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | Fuzzing | project is not fuzzed | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#fuzzing |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | License | license file detected | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#license |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 10 / 10 | Maintained | 30 commit(s) and 12 issue | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#maintained |
| | | activity found in the last 90 | |
| | | days -- score normalized to 10 | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| ? | Packaging | packaging workflow not | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#packaging |
| | | detected | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | Pinned-Dependencies | dependency not pinned by hash | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#pinned-dependencies |
| | | detected -- score normalized | |
| | | to 0 | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | SAST | SAST tool is not run on all | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#sast |
| | | commits -- score normalized to | |
| | | 0 | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | Security-Policy | security policy file not | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#security-policy |
| | | detected | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 8 / 10 | Signed-Releases | 1 out of the last 1 releases | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#signed-releases |
| | | have a total of 1 signed | |
| | | artifacts. | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 0 / 10 | Token-Permissions | detected GitHub workflow | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#token-permissions |
| | | tokens with excessive | |
| | | permissions | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|
| 7 / 10 | Vulnerabilities | 3 existing vulnerabilities | https://github.com/ossf/scorecard/blob/ea7e27ed41b76ab879c862fa0ca4cc9c61764ee4/docs/checks.md#vulnerabilities |
| | | detected | |
|---------|------------------------|--------------------------------|-----------------------------------------------------------------------------------------------------------------------|