Set up basic CI

.drone.yml

@@ -24,5 +24,14 @@ steps:
       - mix compile --warnings-as-errors
       # Check formatting
       - mix format --check-formatted
+      # Wait for postgres to become available
+      - |    
+        for i in {1..20}; do
+          pg_isready -h postgres -p $DATABASE_PORT && break
+          sleep 2
+        done
+        echo "Postgres did not become available, aborting"
+        exit 1
+    done
       # Run tests
       - mix test