[fix] new tag dev6

keep :latest and :release tags aligned
add dev:6  tag for snapshots from develop-6.x.x

see eXist-db#3953

.github/workflows/ci-deploy.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     # NOTE (DP): Publish on develop and master, test on PRs against these
     # TODO(DP) Reinstate CRONed release builds to update stock apps regularly
-    if: github.ref == 'refs/heads/develop' || github.ref == 'refs/heads/develop-6.x.x' || github.base_ref ==  'develop' || github.base_ref ==  'develop-6.x.x'
+    if: github.ref == 'refs/heads/develop' || github.ref == 'refs/heads/develop-6.x.x' || github.ref == 'refs/heads/master'|| github.base_ref ==  'develop' || github.base_ref ==  'develop-6.x.x' || github.base_ref ==  'master'
     steps:
       - uses: actions/checkout@v4
         with:
@@ -56,8 +56,16 @@ jobs:
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
         run: mvn -q -Ddocker.tag=latest -Ddocker.username=$DOCKER_USERNAME -Ddocker.password=$DOCKER_PASSWORD docker:build docker:push
         working-directory: ./exist-docker
-      - name: Publish release images
+      - name: Publish dev6 images
         if: github.ref == 'refs/heads/develop-6.x.x'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        run: mvn -q -Ddocker.tag=dev6 -Ddocker.username=$DOCKER_USERNAME -Ddocker.password=$DOCKER_PASSWORD docker:build docker:push
+        working-directory: ./exist-docker
+      - name: Publish release images
+        if: github.ref == 'refs/heads/master'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}