Add github actions for PR metadata (#1833)

Signed-off-by: Grant Griffiths <[email protected]>

.github/labeler.yml

@@ -0,0 +1,11 @@
+area/csi:
+- csi/**/*
+area/ci:
+- .travis
+- .github/**/*
+area/osd-cmd:
+- osd/**/*
+area/api:
+- api/**/*
+area/sdk-server:
+- api/server/sdk/**/*

.github/workflows/cron-stale.yml

@@ -0,0 +1,17 @@
+name: 'Mark stale issues PR that need review'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale-in-review:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-pr-message: 'This issue is stale because it has been in review for 5 days with no activity.'
+          only-pr-labels: stage/in-review
+          days-before-stale: 5
+          stale-pr-label: stage/in-review-stale
+

.github/workflows/on-pr.yml

@@ -0,0 +1,33 @@
+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler
+
+name: Labeler
+on: [pull_request]
+jobs:
+  size-label:
+    runs-on: ubuntu-latest
+    name: Label the PR size
+    steps:
+      - uses: codelytv/pr-size-labeler@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          xs_max_size: '10'
+          s_max_size: '100'
+          m_max_size: '500'
+          l_max_size: '1000'
+          fail_if_xl: 'false'
+          message_if_xl: >
+            'This PR exceeds the recommended size of 1000 lines.
+            Please make sure you are NOT addressing multiple issues with one PR.
+            Note this PR might be rejected due to its size.’
+          github_api_url: 'api.github.com'
+  area-label:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/on-review-requsted.yml

@@ -0,0 +1,19 @@
+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler
+
+name: Review requested
+on:
+  pull_request:
+    types: [review_requested]
+jobs:
+  review-label:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions-ecosystem/action-add-labels@v1
+      with:
+        labels: stage/in-review
+        github_token: "${{ secrets.GITHUB_TOKEN }}"