Add substreams cli installation.

Comment out S3 upload for now.

.github/workflows/substream.cd.yaml

@@ -31,6 +31,14 @@ jobs:
         with:
           cache-on-failure: true
 
+      - name: Install Substreams CLI
+        run: |
+          # Use correct binary for your platform
+          LINK=$(curl -s https://api.github.com/repos/streamingfast/substreams/releases/latest | awk "/download.url.*linux_$(uname -m)/ {print \$2}" | sed 's/"//g')
+          curl -L "$LINK" | tar zxf - -C /usr/local/bin
+          chmod +x /usr/local/bin/substreams
+          substreams --version
+
       - name: Run checks
         run: |
           cd substreams