Merge pull request #95 from hirokiwa/94-automate-creation-of-prs-to-m…

…ain-branch

94 automate creation of prs to main branch

.github/workflows/createPR.yaml

@@ -0,0 +1,28 @@
+name: Create a pull request for release.
+
+on:
+  push:
+    branches: [ develop ]
+
+jobs:
+  create-release-pr:
+    runs-on: ubuntu-latest
+
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Check if pr exists
+        id: check_pr
+        run: |
+          pr_title=${{ (github.ref == 'refs/heads/develop' && 'Develop') || '' }}
+          base_branch=${{ (github.ref == 'refs/heads/develop' && 'main') || 'develop' }}
+          echo "::set-output name=count::$(gh pr list -S ${pr_title}' in:title' -B $base_branch | wc -l)"
+          echo "::set-output name=pr_title::$pr_title"
+          echo "::set-output name=base_branch::$base_branch"
+      - name: Create release pr
+        if: ${{ steps.check_pr.outputs.count == 0 }}
+        run: |
+          gh pr create -B ${{ steps.check_pr.outputs.base_branch }} -t ${{ steps.check_pr.outputs.pr_title }} -b ""