Merge branch 'avoid-cache-for-ssh-build' into 'develop'

Use --no-cache option in order to force re-scan of server ssh keys.

See merge request !70

Makefile

@@ -116,7 +116,7 @@ xml-lint: xml-lint/Dockerfile
 # Utility Images
 ####################
 alpine-ssh-client: alpine-ssh-client/Dockerfile
-	docker build $(BUILD_ARGS) -t ${REPO_ORG}/alpine-ssh-client:latest alpine-ssh-client/
+	docker build $(BUILD_ARGS) --no-cache -t ${REPO_ORG}/alpine-ssh-client:latest alpine-ssh-client/
 
 merge-request-check: merge-request-check/Dockerfile
 	docker build $(BUILD_ARGS) -t ${REPO_ORG}/merge-request-check:latest merge-request-check/