Add first issue/PR welcome message action (#185)

* Add first issue/PR welcome message action

Signed-off-by: Robert Prince <robert.prince@anchore.com>

* update first-pr-issue message with a simple greeting

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

Co-authored-by: Alex Goodman <alex.goodman@anchore.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>

.github/workflows/first-pr-issue-message.yaml

@@ -0,0 +1,15 @@
+name: Greetings
+
+on: [pull_request, issues]
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/first-interaction@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        issue-message: |-
+          Hey :wave:! Welcome to the repo and thanks for reporting, we'll review this issue soon!
+        pr-message: |-
+          Hey :wave:! Welcome to the repo and thanks for your contribution, we'll review your PR soon!