Post a welcome comment only when opened (#669)

* Remove comment action from pr.yaml

* Add pr-comment-welcome.yaml

.github/workflows/pr-comment-welcome.yaml

@@ -0,0 +1,44 @@
+name: Pull Request Welcome Comment Flow
+
+on:
+  pull_request_target:
+    types: [opened]
+# tags-ignore and/or paths does not work with pull_request_target
+#    tags-ignore:
+#      - "automated pr"
+#    paths:
+#      - "packages/**"
+
+jobs:
+  welcome:
+    name: Welcome comment
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: comment PR
+        uses: actions/github-script@v2
+        env:
+          HEAD_BRANCH: ${{ github.head_ref }}
+          GITHUB_ACTOR: ${{ github.actor }}
+        with:
+          github-token: ${{ github.token }}
+          script: |
+            github.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `
+            🎉🎉🎉 Thank you for sending a PR!
+
+            If this PR is to add new or updated SATySFi libraries, I would like you to include your new library in the package snapshots, by following the instructions below.
+
+            After the CI passes, choose “automatic follow-up” options to add your libraries to add snapshots.
+            Please leave a comment in case you don't want.
+
+            **Notes:** I recommend adding your libraries to the snapshot with the latest develop version as well
+            if your library supports the latest stable version,
+            because the snapshot with the latest develop version will be the snapshot with the the comming SATySFi stable version.
+
+            Thanks!
+            `
+            })

.github/workflows/pr.yaml

@@ -54,31 +54,3 @@ jobs:
               ...pullRequestId,
               body: replacedBody
             });
-
-      - name: comment PR
-        uses: actions/github-script@v2
-        env:
-          HEAD_BRANCH: ${{ github.head_ref }}
-          GITHUB_ACTOR: ${{ github.actor }}
-        with:
-          github-token: ${{ github.token }}
-          script: |
-            github.issues.createComment({
-              issue_number: context.issue.number,
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              body: `
-            🎉🎉🎉 Thank you for sending a PR!
-
-            If this PR is to add new or updated SATySFi libraries, I would like you to include your new library in the package snapshots, by following the instructions below.
-
-            After the CI passes, choose “automatic follow-up” options to add your libraries to add snapshots.
-            Please leave a comment in case you don't want.
-
-            **Notes:** I recommend adding your libraries to the snapshot with the latest develop version as well
-            if your library supports the latest stable version,
-            because the snapshot with the latest develop version will be the snapshot with the the comming SATySFi stable version.
-
-            Thanks!
-            `
-            })