containerized Jenkins (#179)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: https://dev.hostsharing.net/hostsharing/hs.hsadmin.ng/pulls/179
Reviewed-by: Timotheus Pokorra <timotheus.pokorra@hostsharing.net>

Jenkins/Makefile

@@ -0,0 +1,54 @@
+DOCKER := docker
+SOCKET := /var/run/docker.sock
+VOLUME := jenkins_home
+
+.PHONY: build run bash init-pw unprotected protected start stop rm purge
+
+# building the Jenkins image
+build:
+	$(DOCKER) build -t jenkins-docker .
+
+# initially running the Jenkins container
+run:
+	$(DOCKER) run --detach \
+		--dns 8.8.8.8 \
+		--network bridge \
+		--publish 8080:8080 --publish 50000:50000 \
+		--volume $(SOCKET):/var/run/docker.sock \
+		--volume $(VOLUME):/var/jenkins_home \
+		--restart unless-stopped \
+		--name jenkins jenkins-docker
+
+# (re-) starts the Jenkins container
+start:
+	$(DOCKER) start jenkins
+
+# opens a bash within the Jenkins container
+bash:
+	$(DOCKER) exec -it jenkins bash
+
+# prints the inital password of a newly setup Jenkins
+init-pw:
+	$(DOCKER) exec -it jenkins cat /var/jenkins_home/secrets/initialAdminPassword
+
+# disables security for the Jenkins, allows login without credentials
+unprotected:
+	docker exec -it jenkins sed -i 's|<useSecurity>true</useSecurity>|<useSecurity>false</useSecurity>|' /var/jenkins_home/config.xml
+	docker exec -it jenkins grep useSecurity /var/jenkins_home/config.xml
+
+# enables security for the Jenkins, requires login with credentials
+protected:
+	docker exec -it jenkins sed -i 's|<useSecurity>true</useSecurity>|<useSecurity>true</useSecurity>|' /var/jenkins_home/config.xml
+	docker exec -it jenkins grep useSecurity /var/jenkins_home/config.xml
+
+# stops the Jenkins container
+stop:
+	$(DOCKER) stop jenkins
+
+# removes the Jenkins container
+rm: stop
+	$(DOCKER) rm jenkins
+
+# purges the Jenkins volume (finally deletes the configuration)
+purge: rm
+	$(DOCKER) volume rm $(VOLUME)