Fix SBOM workflow by adding ref parameter for checkout and ensuring push to master branch

.gitea/workflows/sbom.yml

@@ -14,6 +14,7 @@ jobs:
         uses: https://git.quad4.io/actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           fetch-depth: 0
+          ref: ${{ github.ref }}
 
       - name: Setup Node.js
         uses: https://git.quad4.io/actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
@@ -53,8 +54,10 @@ jobs:
           git config --global user.name "Gitea Action"
           git config --global user.email "actions@noreply.quad4.io"
           git remote set-url origin https://${{ secrets.GITEA_TOKEN }}@git.quad4.io/${{ github.repository }}.git
+          git fetch origin master
+          git checkout master
           git add sbom/
-          git diff --quiet && git diff --staged --quiet || (git commit -m "Auto-update SBOM [skip ci]" && git push)
+          git diff --quiet && git diff --staged --quiet || (git commit -m "Auto-update SBOM [skip ci]" && git push origin master)
         env:
           GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}