fix: update-check.sh should query GH Releases (#3666)

* fix: Source `VERSION` from image ENV

Now CI builds triggered from tagged releases will always have the correct version. No need for manually updating a separate file.

* fix: Query latest GH release tag

Compare to the remote GH release tag published, rather than contents of a `VERSION` file.

`VERSION` file remains in source for now as prior releases still rely on it for an update notification.

* chore: Switch from `yq` to `jaq`

- Can more easily express a string subslice.
- Lighter weight: 9.3M vs 1.7M.
- Drawback, no YAML input/output support.

If `yq` is preferred, the `v` prefix could be removed via BASH easily enough.

* chore: Add entry to `CHANGELOG.md`

* ci: `VERSION` has no relevance to `:edge`

* docs: Update build guide + simplify `make build`

---------

Co-authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>

.github/workflows/default_on_push.yml

@@ -11,7 +11,6 @@ on:
       - .gitmodules
       - Dockerfile
       - setup.sh
-      - VERSION # also update :edge when a release happens
     tags:
       - '*.*.*'
 

.github/workflows/generic_publish.yml

@@ -66,18 +66,13 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: 'Acquire the image version'
-        id: get-version
-        shell: bash
-        run: echo "version=$(<VERSION)" >>"${GITHUB_OUTPUT}"
-
       - name: 'Build and publish images'
         uses: docker/build-push-action@v5.1.0
         with:
           context: .
           build-args: |
+            DMS_RELEASE=${{ github.ref_type == 'tag' && github.ref_name || 'edge' }}
             VCS_REVISION=${{ github.sha }}
-            VCS_VERSION=${{ steps.get-version.outputs.version }}
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.prep.outputs.tags }}