Use .env file for environment variable defaults. Add docker-compose

.gitignore

-agent_token.txt
-credentials.env
+.env

docker-compose.yml

+version: "3"
+services:
+  iics-secure-agent:
+    build: .
+    image: iics_secure_agent
+    hostname: "${HOSTNAME}" # Agent name that will show up in the IICS Admin Dashboard
+    environment:            # Values can be set in the .env file
+      INFORMATICA_USER:
+      INFORMATICA_PASSWORD:
+      JSON_LOG: "true"