Prepare 3.4.x branch

.github/workflows/build-and-deploy-snapshot.yml

@@ -2,7 +2,7 @@ name: Build and Deploy Snapshot
 on:
   push:
     branches:
-      - main
+      - '3.4.x'
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
 jobs:

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 on:
   push:
     branches:
-      - main
+      - '3.4.x'
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
 jobs:

.github/workflows/run-system-tests.yml

@@ -2,7 +2,7 @@ name: Run System Tests
 on:
   push:
     branches:
-      - main
+      - '3.4.x'
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
 jobs:

.github/workflows/trigger-docs-build.yml

@@ -1,7 +1,7 @@
 name: Trigger Docs Build
 on:
   push:
-    branches: main
+    branches: '3.4.x'
     paths: [ 'antora/*' ]
   workflow_dispatch:
     inputs: