common: trigger the main workflow for branches that are not maintained on pmem/pmdk

.github/workflows/main.yml

@@ -4,6 +4,13 @@ name: Main
 on:
   workflow_dispatch:
   pull_request:
+  push:
+    # It is just for developer convenience so pushes to forks triggers the same
+    # workflow as for pull requests. For branches that match the following
+    # ignore patterns, the workflow has to be triggered manually.
+    branches-ignore:
+      - master
+      - stable-*
 
 jobs:
   src_checkers:

.github/workflows/ubuntu.yml

@@ -48,5 +48,11 @@ jobs:
       - name: Run the build
         env:
           TEST_BUILD: ${{ matrix.TEST_BUILD }}
-          COVERAGE: ${{ matrix.COVERAGE }}
+          # Pushes to branches on developer forks (please see the caller workflow)
+          # won't measure coverage. Coverage is meant to be measured only for
+          # pull requests.
+          # Note: Pull requests to forks will measure coverage as well.
+          # Note: github.event_name for a workflow which has been called by
+          # another workflow contains the triggering event of the caller workflow.
+          COVERAGE: ${{ github.event_name == 'pull_request' && matrix.COVERAGE || 0 }}
         run: cd $WORKDIR && ./build-CI.sh