Add block height workflow

.github/workflows/get_backend_block_height.yml

@@ -0,0 +1,19 @@
+name: 'Check if servers are in sync'
+
+on: [workflow_dispatch]
+
+jobs:
+  print-backend-sha:
+    runs-on: 'ubuntu-latest'
+    name: Get block height
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: repo
+
+      - name: Run script
+        working-directory: repo
+        run: |
+          chmod +x ./scripts/get_block_tip_height.sh
+          sh ./scripts/get_block_tip_height.sh

scripts/get_block_tip_height.sh

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+BASE_HEIGHT=$(curl -sk https://node202.tk7.mempool.space/api/v1/blocks/tip/height)
+IN_SYNC=true
+echo "Base height (node202.tk7): $BASE_HEIGHT"
+
+for LOCATION in fmt va1 fra tk7
+do
+  for NODE in 201 202 203 204 205 206
+  do
+    NODE_HEIGHT=$(curl -sk https://node$NODE.$LOCATION.mempool.space/api/v1/blocks/tip/height)
+    echo $(echo node$NODE.$LOCATION.mempool.space) - $NODE_HEIGHT
+    if [ "$NODE_HEIGHT" -ne "$BASE_HEIGHT" ]; then
+      echo $(echo node$NODE.$LOCATION.mempool.space) is not in sync
+      IN_SYNC=false
+    fi
+  done
+done
+
+if [ "$IN_SYNC" = false ]; then
+  echo "One or more servers are out of sync. Check the logs."
+  exit -1
+else
+  echo "All servers are in sync."
+fi
+