chore: discourage LLM-generated PRs (#26211)

* chore: discourage LLM-generated PRs

* chore: add reading CONTRIBUTING.md to PR checklist

* chore: workflow to close LLM-generated PRs

.github/pull_request_template.md

@@ -26,6 +26,7 @@ The `/api/something` endpoint is now `/api/something-else`
 
 ## Checklist:
 
+- [ ] I have carefully read CONTRIBUTING.md
 - [ ] I have performed a self-review of my own code
 - [ ] I have made corresponding changes to the documentation if applicable
 - [ ] I have no unrelated changes in the PR.

.github/workflows/close-llm-pr.yml

@@ -0,0 +1,38 @@
+name: Close LLM-generated PRs
+
+on:
+  pull_request:
+    types: [labeled]
+
+permissions: {}
+
+jobs:
+  comment_and_close:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.label.name == 'llm-generated' }}
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Comment and close
+        env:
+          GH_TOKEN: ${{ github.token }}
+          NODE_ID: ${{ github.event.pull_request.node_id }}
+        run: |
+          gh api graphql \
+            -f prId="$NODE_ID" \
+            -f body="Thank you for your interest in contributing to Immich! Unfortunately this PR looks like it was generated using an LLM. As noted in our CONTRIBUTING.md, we request that you don't use LLMs to generate PRs as those are not a good use of maintainer time." \
+            -f query='
+              mutation CommentAndClosePR($prId: ID!, $body: String!) {
+                addComment(input: {
+                  subjectId: $prId,
+                  body: $body
+                }) {
+                  __typename
+                }
+
+                closePullRequest(input: {
+                  pullRequestId: $prId
+                }) {
+                  __typename
+                }
+              }'