Add gateway screen capture workflow (#34)

Author: Pigbibi

.github/workflows/capture-screen.yml

@@ -0,0 +1,123 @@
+name: Capture Gateway Screen
+
+on:
+  workflow_dispatch:
+
+env:
+  GCP_PROJECT_ID: interactivebrokersquant
+  GCP_WORKLOAD_IDENTITY_PROVIDER: projects/303168642265/locations/global/workloadIdentityPools/github-actions/providers/github-ibkr-gateway-main
+  GCP_WORKLOAD_IDENTITY_SERVICE_ACCOUNT: ibkr-gateway-deploy@interactivebrokersquant.iam.gserviceaccount.com
+
+jobs:
+  capture:
+    runs-on: ubuntu-latest
+    timeout-minutes: 8
+    permissions:
+      contents: read
+      id-token: write
+    env:
+      GCE_USER: ${{ vars.IB_GATEWAY_GCE_USER }}
+      GCE_INSTANCE_NAME: ${{ vars.IB_GATEWAY_INSTANCE_NAME }}
+      GCE_ZONE: ${{ vars.IB_GATEWAY_ZONE }}
+      SSH_PRIVATE_KEY_SECRET_NAME: ${{ vars.IB_GATEWAY_SSH_PRIVATE_KEY_SECRET_NAME }}
+    steps:
+      - name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@v3
+        with:
+          workload_identity_provider: ${{ env.GCP_WORKLOAD_IDENTITY_PROVIDER }}
+          service_account: ${{ env.GCP_WORKLOAD_IDENTITY_SERVICE_ACCOUNT }}
+
+      - name: Set up gcloud
+        uses: google-github-actions/setup-gcloud@v3
+        with:
+          project_id: ${{ env.GCP_PROJECT_ID }}
+          version: '>= 416.0.0'
+
+      - name: Prepare SSH key
+        run: |
+          set -euo pipefail
+
+          if [ -z "${SSH_PRIVATE_KEY_SECRET_NAME:-}" ]; then
+            echo "SSH_PRIVATE_KEY_SECRET_NAME is required." >&2
+            exit 1
+          fi
+
+          install -d -m 700 "$RUNNER_TEMP/ssh"
+          SSH_KEY_FILE="$RUNNER_TEMP/ssh/google_compute_engine"
+          ssh_private_key="$(gcloud secrets versions access latest \
+            --project "${GCP_PROJECT_ID}" \
+            --secret "${SSH_PRIVATE_KEY_SECRET_NAME}")"
+          printf '%s\n' "$ssh_private_key" | tr -d '\r' > "$SSH_KEY_FILE"
+          chmod 600 "$SSH_KEY_FILE"
+          ssh-keygen -y -f "$SSH_KEY_FILE" > "$SSH_KEY_FILE.pub"
+          chmod 644 "$SSH_KEY_FILE.pub"
+          echo "SSH_KEY_FILE=$SSH_KEY_FILE" >> "$GITHUB_ENV"
+
+      - name: Capture X11 screen
+        run: |
+          set -euo pipefail
+
+          for var_name in GCE_USER GCE_INSTANCE_NAME GCE_ZONE; do
+            if [ -z "${!var_name:-}" ]; then
+              echo "${var_name} is required." >&2
+              exit 1
+            fi
+          done
+
+          REMOTE_TARGET="${GCE_USER}@${GCE_INSTANCE_NAME}"
+          SSH_FLAGS=(
+            --project "${GCP_PROJECT_ID}"
+            --zone "${GCE_ZONE}"
+            --quiet
+            --tunnel-through-iap
+            --ssh-key-file "${SSH_KEY_FILE}"
+            --ssh-flag="-o ServerAliveInterval=30"
+            --ssh-flag="-o ServerAliveCountMax=4"
+            --ssh-flag="-o TCPKeepAlive=yes"
+          )
+          SCP_FLAGS=(
+            --project "${GCP_PROJECT_ID}"
+            --zone "${GCE_ZONE}"
+            --quiet
+            --tunnel-through-iap
+            --ssh-key-file "${SSH_KEY_FILE}"
+            --scp-flag="-o ServerAliveInterval=30"
+            --scp-flag="-o ServerAliveCountMax=4"
+            --scp-flag="-o TCPKeepAlive=yes"
+          )
+
+          remote_png="/tmp/ibkr-gateway-screen.png"
+          local_png="$RUNNER_TEMP/ibkr-gateway-screen.png"
+          REMOTE_COMMAND=$(cat <<'EOF'
+          set -euo pipefail
+
+          sudo docker exec -u root ib-gateway bash -lc '
+            set -euo pipefail
+            export DEBIAN_FRONTEND=noninteractive
+            if ! command -v xwd >/dev/null 2>&1 || ! command -v xwdtopnm >/dev/null 2>&1 || ! command -v pnmtopng >/dev/null 2>&1; then
+              apt-get update
+              apt-get install -y --no-install-recommends x11-apps netpbm
+              apt-get clean
+              rm -rf /var/lib/apt/lists/*
+            fi
+            export DISPLAY=:1
+            xwd -root -silent -out /tmp/ibkr-gateway-screen.xwd
+            xwdtopnm /tmp/ibkr-gateway-screen.xwd | pnmtopng > /tmp/ibkr-gateway-screen.png
+            chmod 0644 /tmp/ibkr-gateway-screen.png
+          '
+          sudo docker cp ib-gateway:/tmp/ibkr-gateway-screen.png /tmp/ibkr-gateway-screen.png
+          chmod 0644 /tmp/ibkr-gateway-screen.png
+          ls -lh /tmp/ibkr-gateway-screen.png
+          EOF
+          )
+
+          gcloud compute ssh "${REMOTE_TARGET}" "${SSH_FLAGS[@]}" --command "${REMOTE_COMMAND}"
+          gcloud compute scp "${REMOTE_TARGET}:${remote_png}" "${local_png}" "${SCP_FLAGS[@]}"
+          echo "SCREENSHOT_PATH=${local_png}" >> "$GITHUB_ENV"
+
+      - name: Upload screenshot
+        uses: actions/upload-artifact@v4
+        with:
+          name: ibkr-gateway-screen
+          path: ${{ env.SCREENSHOT_PATH }}
+          if-no-files-found: error