Chore: Migrate main-lint-backend drone pipeline to GHAs (#102494)

* baldm0mma/ adjust triggers to run on push to main

* baldm0mma/ rename and update codeowners

.github/CODEOWNERS

@@ -768,6 +768,7 @@ embed.go @grafana/grafana-as-code
 /.github/workflows/alerting-swagger-gen.yml @grafana/alerting-backend
 /.github/workflows/alerting-update-module.yml @grafana/alerting-backend
 /.github/workflows/auto-milestone.yml @grafana/grafana-developer-enablement-squad
+/.github/workflows/backend-code-checks.yml @grafana/grafana-backend-group
 /.github/workflows/backend-unit-tests.yml @grafana/grafana-backend-group
 /.github/workflows/backport.yml @grafana/grafana-developer-enablement-squad
 /.github/workflows/bump-version.yml @grafana/grafana-developer-enablement-squad
@@ -791,7 +792,6 @@ embed.go @grafana/grafana-as-code
 /.github/workflows/lint-build-docs.yml @grafana/docs-tooling
 /.github/workflows/metrics-collector.yml @torkelo
 /.github/workflows/milestone.yml @tolzhabayev
-/.github/workflows/pr-backend-code-checks.yml @grafana/grafana-backend-group
 /.github/workflows/pr-checks.yml @tolzhabayev
 /.github/workflows/pr-codeql-analysis-go.yml @DanCech
 /.github/workflows/pr-codeql-analysis-javascript.yml @DanCech

.github/workflows/backend-code-checks.yml

@@ -7,6 +7,13 @@ on:
       - '*.md'
       - 'docs/**'
       - 'latest.json'
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '*.md'
+      - 'docs/**'
+      - 'latest.json'
 
 permissions:
   contents: read
@@ -44,8 +51,8 @@ jobs:
         
       - name: Generate and Validate OpenAPI Specs
         run: |
-          # For forks, we'll just run the basic swagger-gen without validation
-          if [[ "${{ github.event.pull_request.head.repo.fork }}" == "true" ]]; then
+          # For PRs from forks, we'll just run the basic swagger-gen without validation
+          if [[ "${{ github.event_name }}" == "pull_request" && "${{ github.event.pull_request.head.repo.fork }}" == "true" ]]; then
             echo "PR is from a fork, skipping enterprise-based validation"
             make swagger-gen
             exit 0
@@ -54,7 +61,7 @@ jobs:
           # Clean and regenerate OpenAPI specs
           make swagger-clean && make openapi3-gen
           
-          # Check if the generated specs differ from what's in the PR
+          # Check if the generated specs differ from what's in the repository
           for f in public/api-merged.json public/openapi3.json; do git add $f; done
           if [ -z "$(git diff --name-only --cached)" ]; then
             echo "OpenAPI specs are up to date!"