CI: remove squash and fix buildah push (#2212)

polkadot/.gitlab-ci.yml

@@ -244,7 +244,6 @@ publish-docker:
       ( echo "no docker credentials provided"; exit 1 )
     - cd ./artifacts
     - buildah bud
-      --squash
         --format=docker
         --build-arg VCS_REF="${CI_COMMIT_SHA}"
         --build-arg BUILD_DATE="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"
@@ -253,10 +252,8 @@ publish-docker:
     - echo "$Docker_Hub_Pass_Parity" |
       buildah login --username "$Docker_Hub_User_Parity" --password-stdin docker.io
     - buildah info
-    - buildah push
-      --format=v2s2
-      "$IMAGE_NAME:$VERSION"
-      "$IMAGE_NAME:$EXTRATAG"
+    - buildah push --format=v2s2 "$IMAGE_NAME:$VERSION"
+    - buildah push --format=v2s2 "$IMAGE_NAME:$EXTRATAG"
   after_script:
     - buildah logout "$IMAGE_NAME"
     # only VERSION information is needed for the deployment