Add some helpful reusable workflows

.editorconfig

@@ -10,6 +10,6 @@ trim_trailing_whitespace = true
 insert_final_newline = true
 end_of_line = lf
 
-[{package.json,*.yml}]
+[{package.json,*.yml,*.md}]
 indent_style = space
 indent_size = 2

.github/workflows/notify-triage.yml

@@ -0,0 +1,17 @@
+name: Ping triage
+
+on:
+  workflow_call:
+
+env:
+  ISSUE_URL: ${{ github.event.issue.url }}
+  GH_TOKEN_SECRET: ${{ github.token }}
+
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+    steps:
+    - run: |
+        export GITHUB_TOKEN="$GH_TOKEN_SECRET"
+        gh issue edit "$ISSUE_URL" --add-project 'Triage/bugs' &&
+        gh issue comment "$ISSUE_URL" --body '@MithrilJS/triage Please take a look.'

.github/workflows/reject-pr.yml

@@ -0,0 +1,21 @@
+name: Reject PR
+
+on:
+  workflow_call:
+    inputs:
+      correct_branch:
+        type: string
+        required: true
+
+jobs:
+  post:
+    runs-on: ubuntu-latest
+    steps:
+    - run: |
+        export GITHUB_TOKEN="$GH_TOKEN_SECRET"
+        gh pr close "$PR_URL" --comment "$MESSAGE" --reason 'not planned' &&
+        gh pr lock "$PR_URL" --reason 'resolved'
+      env:
+        GITHUB_TOKEN: ${{ github.token }}
+        PR_URL: ${{ github.event.issue.url }}
+        MESSAGE: Hey @${{ github.actor }}, this pull request should be directed towards `${{ inputs.correct_branch }}`. Please file a new pull request targeting that branch instead.

README.md

@@ -1,12 +1,17 @@
 **⚠⚠⚠ Warning: this repo is under construction. ⚠⚠⚠**
 
-# MithrilJS global deploy scripts
+# MithrilJS shared infra workflows and scripts
 
-This handles all deploy processes and centralizes all the permissions.
+This handles all deploy processes and centralizes all the permissions. It also includes some utility scripts
 
-> Admins should use [the runbook](./RUNBOOK.md) to know how to do various things.
+> Admins should consult [the runbook](./RUNBOOK.md) as well.
 
-## Usage
+- [Deploy](#deploy)
+- [Block a PR with a comment](#block-a-pr-with-a-comment)
+- [Notify triage](#notify-triage)
+- [License](#license)
+
+## Deploy
 
 It's a multi-step process.
 
@@ -35,6 +40,58 @@ It's a multi-step process.
      root_dir: ${{ github.workspace }}/path/to/package
    ```
 
+## Block a PR with a comment
+
+Usage is pretty simple. Suppose development is occurring on `main` and the PR is to the special branch `release`. You can use this workflow to handle it easily.
+
+```yml
+name: Deny pushing to `release`
+on:
+  pull_request:
+    types: [opened]
+    branches: [release]
+permissions:
+  issues: write
+jobs:
+  reject:
+    uses: MithrilJS/infra/.github/workflows/reject-pr.yml@main
+```
+
+If the right branch isn't `main`, you can specify it explicitly. Suppose it's `next` instead. It's still just as easy.
+
+```yml
+name: Deny pushing to `release`
+on:
+  pull_request:
+    types: [opened]
+    branches: [release]
+permissions:
+  issues: write
+jobs:
+  reject:
+    uses: MithrilJS/infra/.github/workflows/reject-pr.yml@main
+    with:
+      correct_branch: next
+```
+
+## Notify triage
+
+Usage is extremely simple. This also implicitly adds the issue to [our tracking project](https://github.com/orgs/MithrilJS/projects/2) for triage.
+
+```yml
+name: Notify triage on issue create
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+permissions:
+  issues: write
+jobs:
+  reject:
+    uses: MithrilJS/infra/.github/workflows/notify-triage.yml@main
+```
+
 ## License
 
 Copyright 2024 Mithril.js Contributors