feat(ci): pass BRANCH to Makefile for correct build tag

.github/workflows/docker-image.yml

@@ -66,6 +66,11 @@ jobs:
             version="v$(date -u +'%Y%m%d-%H%M')"
           fi
           echo "VERSION_FOR_BUILD=$version" >> $GITHUB_ENV
+          if [ "${GITHUB_REF_TYPE}" = "branch" ]; then
+            echo "BRANCH_FOR_BUILD=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+          else
+            echo "BRANCH_FOR_BUILD=" >> $GITHUB_ENV
+          fi
 
       - name: Docker meta
         id: meta
@@ -105,6 +110,7 @@ jobs:
           build-args: |
             VERSION=${{ env.VERSION_FOR_BUILD }}
             MAKE_ARGS=${{ env.MAKE_ARGS }}
+            BRANCH=${{ env.BRANCH_FOR_BUILD }}
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1