Added homebrew formula action (#558)

* Added homebrew formula action to push-to-npm.yml

Signed-off-by: Rlin232 <rlin@mitre.org>

* Moved workflow to different yml file

Signed-off-by: Rlin232 <rlin@mitre.org>

Signed-off-by: Rlin232 <rlin@mitre.org>

.github/workflows/bump-brew.yml

@@ -0,0 +1,27 @@
+name: Bump Homebrew formula
+
+on:
+  release:
+    types: [published]
+jobs:
+  build-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Extract version
+        id: extract-version
+        run: |
+          printf "::set-output name=%s::%s\n" tag-name "${GITHUB_REF#refs/tags/}"
+      - uses: mislav/bump-homebrew-formula-action@v2.1
+        if: "!contains(github.ref, '-')" # skip prereleases
+        with:
+          formula-name: saf-cli
+          formula-path: Formula/saf-cli.rb
+          homebrew-tap: mitre/homebrew-saf
+          base-branch: main
+          download-url: https://registry.npmjs.org/@mitre/saf/-/saf-${{ steps.extract-version.outputs.tag-name }}.tgz
+          commit-message: |
+            {{formulaName}} {{version}}
+
+            Created by https://github.com/mislav/bump-homebrew-formula-action
+        env:
+          COMMITTER_TOKEN: ${{ secrets.COMMITTER_TOKEN }}