fix(ci): use free gitleaks docker image

Switch from gitleaks-action to zricethezav/gitleaks docker image to bypass commercial license requirements.

.gitea/workflows/test-ci.yml

@@ -16,13 +16,14 @@ jobs:
   gitleaks-scan:
     name: Secret Detection (Gitleaks)
     runs-on: ubuntu-latest
+    container:
+      image: zricethezav/gitleaks:latest
     steps:
       - name: Check Out Code
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
-      - name: Run Gitleaks
-        uses: gitleaks/gitleaks-action@v2
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Run Gitleaks Scan
+        run: |
+          gitleaks detect --source . -v