install socat

.github/workflows/PebbleStrict.yml

@@ -15,6 +15,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Install tools
+      run: sudo apt-get install -y socat
     - name: Run Pebble
       run: cd .. && curl https://raw.githubusercontent.com/letsencrypt/pebble/master/docker-compose.yml >docker-compose.yml && docker-compose up -d
     - name: Set up Pebble