feat: add opencode agent automation (#178)

* feat: add opencode agent automation

* chore: update Cargo.lock

.github/workflows/opencode-agents.yml

@@ -0,0 +1,79 @@
+name: Opencode Agents
+
+on:
+  issues:
+    types: [opened]
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  triage-issue:
+    if: github.event_name == 'issues'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install opencode
+        run: curl -fsSL https://opencode.ai/install | bash
+
+      - name: Triage issue
+        env:
+          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_TITLE: ${{ github.event.issue.title }}
+          ISSUE_BODY: ${{ github.event.issue.body }}
+        run: |
+          opencode run --agent triage "The following issue was just opened, triage it:
+
+          Title: $ISSUE_TITLE
+
+          $ISSUE_BODY"
+
+  duplicate-prs:
+    if: github.event_name == 'pull_request_target' && github.event.pull_request.user.login != 'opencode-agent[bot]'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install opencode
+        run: curl -fsSL https://opencode.ai/install | bash
+
+      - name: Build prompt
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          {
+            echo "Check for duplicate PRs related to this new PR:"
+            echo ""
+            echo "CURRENT_PR_NUMBER: $PR_NUMBER"
+            echo ""
+            echo "Title: $(gh pr view \"$PR_NUMBER\" --json title --jq .title)"
+            echo ""
+            echo "Description:"
+            gh pr view "$PR_NUMBER" --json body --jq .body
+          } > pr_info.txt
+
+      - name: Check for duplicate PRs
+        env:
+          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          COMMENT=$(opencode run --agent duplicate-pr "$(cat pr_info.txt)")
+
+          gh pr comment "$PR_NUMBER" --body "_The following comment was made by an LLM, it may be inaccurate:_
+
+          $COMMENT"