Adjust docker-compose and SSL config

SSL is disabled by default as it is documented in the README.
Expose a port for cassandra docker.
Fix sdc-workflow-backend SDC_ENDPOINT environment variable.
Add some build artifacts to gitignore.

Issue-ID: SDC-3020
Change-Id: If4d81752f6b7c2c1ec2a73327bebbb8ef3ce0420
Signed-off-by: andre.schmid <andre.schmid@est.tech>
diff --git a/docker-compose/.env b/docker-compose/.env
index 58f6cb3..0268cd6 100644
--- a/docker-compose/.env
+++ b/docker-compose/.env
@@ -1,4 +1,5 @@
-IMAGE_TAG=latest
+#IMAGE_TAG=latest
+# If you want to use your local build, leave the value empty REGISTRY=
 REGISTRY=nexus3.onap.org:10001/
 JAVA_OPTIONS=-Xmx1536m -Xms1536m
 # CS_HOST is set to a dummy string "yyy". This pattern will be used as an identifier to be replaced by the actual
@@ -19,4 +20,6 @@
 SDC_USER=workflow
 SDC_PASSWORD=Kp8bJ4SXszM0WXlhak3eHlcse2gAw84vaoGGmJvUy2U
 FRONTEND_PORT=8184
-FRONTEND_DEBUG_PORT=7000
\ No newline at end of file
+FRONTEND_DEBUG_PORT=7000
+# To enable HTTPS
+#SERVER_SSL_ENABLED=true
\ No newline at end of file