ci: Add opencode to GitHub (#605)

Author: PierreQuinton

.github/workflows/opencode.yml

@@ -0,0 +1,38 @@
+name: opencode
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  opencode:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '/opencode')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '/opencode')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '/opencode')) ||
+      (github.event_name == 'issues' && contains(github.event.issue.body, '/opencode'))
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+      pull-requests: read
+      issues: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+          persist-credentials: false
+
+      - name: Run opencode
+        uses: anomalyco/opencode/github@v1
+        env:
+          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
+        with:
+          model: opencode-go/glm-5