ci: add opencode workflow test

.github/workflows/opencode.yml

@@ -0,0 +1,62 @@
+name: opencode
+
+on:
+  issues:
+    types: [opened, edited, labeled, assigned]
+  pull_request:
+    types: [opened, synchronize, reopened, review_requested]
+  issue_comment:
+    types: [created]
+
+jobs:
+  opencode:
+    if: |
+      contains(github.event.comment.body, ' /oc') ||
+      startsWith(github.event.comment.body, '/oc') ||
+      contains(github.event.comment.body, ' /opencode') ||
+      startsWith(github.event.comment.body, '/opencode')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Inject Custom Config (For Proxy Support)
+        run: |
+          mkdir -p ~/.config/opencode
+          # Build and write opencode.json with secrets
+          CONFIG='{
+            "$schema": "https://opencode.ai/config.json",
+            "providers": {
+              "llm-proxy": {
+                "npm": "@ai-sdk/openai-compatible",
+                "name": "Proxy",
+                "options": {
+                  "baseURL": "${{ secrets.PROXY_BASE_URL }}",
+                  "apiKey": "${{ secrets.PROXY_API_KEY }}",
+                  "headers": {
+                    "User-Agent": "OpenCode/1.0",
+                    "X-Custom-Header": "your-value"
+                  }
+                },
+                "models": {
+                  "gemini/gemini-2.5-pro": {
+                    "name": "Gemini 2.5 pro via Proxy"
+                  }
+                }
+              }
+            },
+            "model": "gemini/gemini-2.5-pro"
+          }'
+          echo "$CONFIG" > ~/.config/opencode/opencode.json
+
+      - name: Run opencode
+        uses: sst/opencode/github@latest
+        env:
+          OPENCODE_API_KEY: ${{ secrets.PROXY_API_KEY }}
+        with:
+          model: llm-proxy/gemini/gemini-2.5-pro