Fix YAML syntax: use jq for comment body to avoid multi-line string issues

Author: openhands-agent

.github/workflows/build-gaia-eval-image.yml

@@ -219,22 +219,23 @@ jobs:
             TRIGGER="${{ github.event_name }}"
           fi
 
-          # Post comment - using printf to avoid backtick issues in YAML
-          COMMENT_BODY="## GAIA Image Build Complete ✅
-
-**SDK Version:** [\\\`${SDK_SHA_SHORT}\\\`](https://github.com/OpenHands/software-agent-sdk/commit/${SDK_SHA})
-**Base Image:** \\\`${IMAGE_TAG}\\\`
-**MCP Image:** \\\`${MCP_IMAGE_TAG}\\\` ⚡ _(MCP server pre-cached)_
-**Workflow Run:** [#${{ github.run_id }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})
-**Triggered by:** ${TRIGGER}
-
-The MCP-enhanced image includes pre-cached \\\`mcp-server-fetch\\\` to eliminate 1-18 minute startup delays."
-
+          # Post comment using jq to properly handle multi-line content
+          jq -n \
+            --arg sdk_short "${SDK_SHA_SHORT}" \
+            --arg sdk_full "${SDK_SHA}" \
+            --arg image "${IMAGE_TAG}" \
+            --arg mcp_image "${MCP_IMAGE_TAG}" \
+            --arg run_id "${{ github.run_id }}" \
+            --arg server_url "${{ github.server_url }}" \
+            --arg repo "${{ github.repository }}" \
+            --arg trigger "${TRIGGER}" \
+            '{body: "## GAIA Image Build Complete ✅\n\n**SDK Version:** [`\($sdk_short)`](https://github.com/OpenHands/software-agent-sdk/commit/\($sdk_full))\n**Base Image:** `\($image)`\n**MCP Image:** `\($mcp_image)` ⚡ _(MCP server pre-cached)_\n**Workflow Run:** [#\($run_id)](\($server_url)/\($repo)/actions/runs/\($run_id))\n**Triggered by:** \($trigger)\n\nThe MCP-enhanced image includes pre-cached `mcp-server-fetch` to eliminate 1-18 minute startup delays."}' | \
           curl -L -X POST \
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
             -H "X-GitHub-Api-Version: 2022-11-28" \
+            -H "Content-Type: application/json" \
             "${{ github.api_url }}/repos/${{ github.repository }}/issues/81/comments" \
-            -d "$(jq -n --arg body "$COMMENT_BODY" '{body: $body}')"
+            -d @-
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}