fix(ci): prevent tagging docker image as latest on every push (#882)

.github/workflows/_buildx.yml

@@ -24,13 +24,15 @@ jobs:
  gzip -d -S binaries/.gz__ -r .
  chmod 755 binaries/shiori_linux_*/shiori
 
+ # Every pull request that goes into master
  - name: Prepare master push tags
  if: github.event_name == 'push' && github.ref == 'refs/heads/master'
  run: |
  REPO=ghcr.io/${{ github.repository }}
  TAG=$(git describe --tags)
- echo "tag_flags=--tag $REPO:$TAG --tag $REPO:latest" >> $GITHUB_ENV
+ echo "tag_flags=--tag $REPO:$TAG" >> $GITHUB_ENV
 
+ # New tagged version
  - name: Prepare version push tags
  if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
  run: |
@@ -44,6 +46,7 @@ jobs:
  fi
  echo "tag_flags=--tag $REPO:$TAG --tag $REPO:$TAG2" >> $GITHUB_ENV
 
+ # Every pull request
  - name: Prepare pull request tags
  if: github.event_name == 'pull_request'
  run: |