Enable automatic labeling of PRs via Actions (#3431)

* Automatically label PRs based on the file paths

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Enable prow-like commands

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Require filling in the PR template

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Update contributor docs to reference PR template

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Expand checklist and ask for issue number on PRs

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Document why we're not enabling /lgtm yet

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Combine PR assignment and labeling workflow

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

.github/PULL_REQUEST_TEMPLATE/pr.md

@@ -0,0 +1,13 @@
+Thank you for contributing to Velero!
+
+# Please add a summary of your change
+
+# Does your change fix a particular issue?
+
+Fixes #(issue)
+
+# Please indicate you've done the following:
+
+[ ] [Accepted the DCO](https://velero.io/docs/v1.5/code-standards/#dco-sign-off). Commits without the DCO will delay acceptance.
+[ ] [Created a changelog file](https://velero.io/docs/v1.5/code-standards/#adding-a-changelog) or added `/kind changelog-not-required`.
+[ ] Updated the corresponding documentation in `site/content/docs/main`.

.github/labels.yml

@@ -0,0 +1,40 @@
+area:
+  - "Cloud/AWS"
+  - "Cloud/GCP"
+  - "Cloud/Azure"
+  - "Plugins"
+
+# Labels that can be applied to PRs with the /kind command
+kind:
+  - "changelog-not-required"
+  - "Tech debt"
+
+# Works with https://github.com/actions/labeler/
+# Below this line, the keys are labels to be applied, and the values are the file globs to match against.
+# Anything in the `design` directory gets the `Design` label.
+Design:
+  - design/*
+
+# Anything in the site directory gets the website label *EXCEPT* docs
+Website:
+  - any: ["site/**/*", "!site/content/docs/**/*"]
+
+Documentation:
+  - site/content/docs/**/*
+
+Dependencies:
+  - go.mod
+
+# Anything that has plugin infra will be labeled.
+# Individual plugins don't necessarily live here, though
+Plugins:
+  - "pkg/plugins/**/*"
+
+has-unit-tests:
+  - "pkg/**/*_test.go"
+
+has-e2e-2tests:
+  - "test/e2e/**/*"
+
+has-changelog:
+  - "changelogs/**"

.github/workflows/auto_assign_prs.yml

@@ -1,16 +1,24 @@
-name: 'Auto Assign PR Reviewers'
+name: "Auto Assign PR Reviewers"
 # pull_request_target means that this will run on pull requests, but in the context of the base repo.
 # This should mean PRs from forks are supported.
-on: 
+on:
   pull_request_target:
     types: [opened, reopened, synchronize, ready_for_review]
 
-
-jobs: 
+jobs:
+  # Automatically assigns reviewers and owner
   add-reviews:
     runs-on: ubuntu-latest
     steps:
       - uses: kentaro-m/auto-assign-action@v1.1.1
-        with: 
+        with:
           configuration-path: ".github/auto_assign.yml"
-          repo-token: '${{ secrets.GITHUB_TOKEN }}'
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+  # Automatically labels PRs based on file globs in the change.
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@main
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          configuration-path: .github/labels.yaml

.github/workflows/prow-action.yml

@@ -0,0 +1,20 @@
+# Adds support for prow-like commands
+# Uses .github/labels.yaml to define areas and kinds
+name: "Prow github actions"
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  execute:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: jpmcb/prow-github-actions@v1
+        with:
+          # Only support /kind command for now.
+          # TODO: before allowing the /lgtm command, see if we can block merging if changelog labels are missing.
+          prow-commands: "/area
+            /kind
+            /cc
+            /uncc"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"