fix(action): pull release image by bare semver tag

The Docker workflow now tags release images with the bare semver
(:X.Y.Z via docker/metadata-action {{version}}), but the composite
action still pulled :vX.Y.Z. That mismatch made every build resolving
to >=v1.2.0 fail with a 404 on docker pull (v1.1.29 and earlier used
the old v-prefixed tag, so they still worked). Pull the un-prefixed
tag to match the current, documented image scheme.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 2 people

action.yml

@@ -89,7 +89,11 @@ runs:
           version="${tag#v}"
         fi
 
-        ref="${image}:v${version}"
+        # Release images are tagged with the bare semver (e.g. `:1.2.0`), matching
+        # docker/metadata-action's `type=semver,pattern={{version}}` and the scheme
+        # documented in docs/development/versioning.md. (Older <=1.1.29 images used a
+        # `v`-prefixed tag; those predate the current tagging workflow.)
+        ref="${image}:${version}"
         echo "Using Netdocs image ${ref}"
         docker pull "${ref}"