build & deploy eth-rpc docker image for stable release (paritytech#10739)

build and deploy eth-rpc docker image for stable branches

---------

Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: pgherveou

.github/workflows/build-publish-eth-rpc.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+      - stable*
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
 
@@ -58,7 +59,7 @@ jobs:
   build_push_docker:
     name: Build and push docker images
     runs-on: parity-large
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/stable')
     needs: [set-variables]
     env:
       VERSION: ${{ needs.set-variables.outputs.VERSION }}

prdoc/pr_10739.prdoc

@@ -0,0 +1,7 @@
+title: build & deploy eth-rpc docker image for stable release
+doc:
+- audience: Runtime Dev
+  description: 'build and deploy eth-rpc docker image for stable branches
+
+    '
+crates: []