ci: stop re-running merge queue checks on push to main

.github/workflows/asyncapi.yml

@@ -3,11 +3,6 @@
 name: AsyncAPI
 
 on:
-  push:
-    branches:
-      - main
-    tags:
-      - "*"
   pull_request:
   merge_group:
     types: [checks_requested]

.github/workflows/backstage.yml

@@ -1,11 +1,6 @@
 name: Backstage
 
 on:
-  push:
-    branches:
-      - main
-    tags:
-      - '*'
   pull_request:
   merge_group:
     types: [checks_requested]

.github/workflows/ci.yml

@@ -15,12 +15,16 @@ on:
     types: [checks_requested]
 
 jobs:
+  # Check jobs skip pushes to main: merge_group already ran them on the same commit.
+  # docs still runs there because publish.yml deploys the main docs from it.
   lint:
+    if: github.ref != 'refs/heads/main'
     uses: ./.github/workflows/_tox.yml
     with:
       tox: pre-commit,type-checking
 
   test:
+    if: github.ref != 'refs/heads/main'
     strategy:
       matrix:
         runs-on: ["ubuntu-latest"] # can add windows-latest, macos-latest
@@ -32,11 +36,12 @@ jobs:
       python-version: ${{ matrix.python-version }}
 
   system-test:
+    if: github.ref != 'refs/heads/main'
     uses: ./.github/workflows/_system_test.yml
 
   container:
     needs: test
-    if: ${{ !cancelled() }}
+    if: ${{ !cancelled() && github.ref != 'refs/heads/main' }}
     uses: ./.github/workflows/_container.yml
     with:
       publish: ${{ needs.test.result == 'success' }}
@@ -53,6 +58,7 @@ jobs:
       html-dir: build/html
 
   dist:
+    if: github.ref != 'refs/heads/main'
     uses: ./.github/workflows/_dist.yml
 
   pypi:

.github/workflows/codeql.yml

@@ -22,8 +22,6 @@ on:
     tags:
       - '*'
   pull_request:
-  merge_group:
-    types: [checks_requested]
 
 jobs:
   analyze: