Make static analysis a cron job (#2003)

#### Reference Issues/PRs
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#### What does this implement or fix?
Make static analysis a cron job running at 3 A.M.
Disable the on-pr run as currently there is a branch limit of 10
branches.
#### Any other comments?

#### Checklist

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  <summary>
   Checklist for code changes...
  </summary>
 
- [ ] Have you updated the relevant docstrings, documentation and
copyright notice?
- [ ] Is this contribution tested against [all ArcticDB's
features](../docs/mkdocs/docs/technical/contributing.md)?
- [ ] Do all exceptions introduced raise appropriate [error
messages](https://docs.arcticdb.io/error_messages/)?
 - [ ] Are API changes highlighted in the PR description?
- [ ] Is the PR labelled as enhancement or bug so it appears in
autogenerated release notes?
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Author: vasil-pashov

.github/workflows/static_analysis.yml

@@ -1,6 +1,9 @@
 ---
   name: Coverity Static Analysis
-  on: [pull_request, workflow_dispatch]
+  on:
+    workflow_dispatch:
+    schedule:
+      - 0 3 * * *
 
   jobs:
     polaris-scan: