dekaf: Update CI logic to use git describe for SHA-like tags to mat…

…ch Flow image tagging

.github/workflows/dekaf.yaml

@@ -28,6 +28,9 @@ jobs:
         run: |
           echo "${{ secrets.GITHUB_TOKEN }}" | \
             docker login --username ${{ github.actor }} --password-stdin ghcr.io
+      - name: Run git describe
+        id: git_describe
+        run: echo "describe_output=$(git describe --dirty --tags)" >> $GITHUB_OUTPUT
       # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image.
       # The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
       - name: Extract metadata (tags, labels) for Docker
@@ -37,7 +40,7 @@ jobs:
           images: ghcr.io/estuary/dekaf
           tags: |
             type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
-            type=sha
+            type=raw,value=${{steps.git_describe.outputs.describe_output}}
             type=ref,event=branch
       # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
       # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.