fix(github): allow releases only on master branch

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Set env
       run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-    - name: Build the Docker image
+    - name: Build, squash and push
       run: |
         echo ${{ secrets.CR_PAT }} | docker login ghcr.io -u $GITHUB_ACTOR --password-stdin
         docker build --tag ghcr.io/tgagor/centos-stream --cache-from ghcr.io/tgagor/centos-stream .
@@ -30,13 +30,15 @@ jobs:
         docker push ghcr.io/tgagor/centos-stream
         docker push ghcr.io/tgagor/centos-stream:${GITHUB_REF##*/}
 
-    - name: SemVer bump version and push tag
+    - name: Bump version and push tag
+      if: github.ref == 'refs/heads/master'
       id: tag_version
       uses: mathieudutour/[email protected]
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Create normal GitHub release
+      if: github.ref == 'refs/heads/master'
       uses: actions/create-release@v1
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -46,8 +48,8 @@ jobs:
         body: ${{ steps.tag_version.outputs.changelog }}
 
     - name: Get current date
-      id: date
       if: github.event_name == 'schedule'
+      id: date
       run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
     - name: Create a weekly GitHub release
       if: github.event_name == 'schedule'