Install requirements via install script

Closes https://git.autonomic.zone/coop-cloud/abra/issues/196.

makefile

@@ -1,4 +1,4 @@
-.PHONY: test shellcheck docopt release-installer build push
+.PHONY: test shellcheck docopt release-installer build push deploy-docopt symlink
 
 test:
 	@sudo DOCKER_CONTEXT=default docker run \
@@ -21,8 +21,9 @@ shellcheck:
 		--rm \
 		-v $$(pwd):/workdir \
 		koalaman/shellcheck-alpine \
-		shellcheck /workdir/abra && \
-		shellcheck /workdir/bin/*.sh
+		sh -c "shellcheck /workdir/abra && \
+		       shellcheck /workdir/bin/*.sh && \
+		       shellcheck /workdir/deploy/install.abra.coopcloud.tech/installer"
 
 docopt:
 	@if [ ! -d ".venv" ]; then \
@@ -32,6 +33,14 @@ docopt:
 	fi
 	.venv/bin/docopt.sh abra
 
+deploy-docopt:
+	@if [ ! -d ".venv" ]; then \
+		python3 -m venv .venv && \
+		.venv/bin/pip install -U pip setuptools wheel && \
+		.venv/bin/pip install docopt-sh; \
+	fi
+	.venv/bin/docopt.sh deploy/install.abra.coopcloud.tech/installer
+
 release-installer:
 	@DOCKER_CONTEXT=swarm.autonomic.zone \
 		docker stack rm abra-installer-script && \