feat: Add context7 configuration file

.github/workflows/.gitleaks.toml

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+title = "gitleaks config"
+
+[extend]
+useDefault = true
+
+# Context7 uses a public key to prove that we own the repository and the
+# website. The key must be public, so it is not a leak.
+[allowlist]
+description = "Context7 public keys"
+regexes = [
+  '''pk_[A-Za-z0-9]+''',
+]

context7.json

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+{
+  "url": "https://context7.com/unikraft/docs",
+  "public_key": "pk_sGpFFXzwa26AbVel5uj4x"
+}

public/context7.json

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+{
+  "url": "https://context7.com/websites/unikraft",
+  "public_key": "pk_sGpFFXzwa26AbVel5uj4x"
+}