feat(nexus): add nexus support

templates/nexus/0/README.md

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+# Nexus for MOLGENIS
+Flexible software for scientific data
+
+## Rancher configuration
+These templates can create a range of MOLGENIS stacks on top of Rancher. The latests and stable release serves 4 docker services:
+
+- Nexus
+
+## Usage
+- Select Nexus from catalog
+- Fill in the questions in the template area 
+- Click *Launch*
+
+## Loadbalancers
+You can check lb.molgenis.org to check the availability of the stack.
+

templates/nexus/0/docker-compose.yml

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+version: '2'
+
+services:
+  jenkins:
+    image: sonatype/nexus3:latest
+    ports:
+      - 8081
+    volumes:
+      - molgenis-nexus:/nexus-data
+    labels:
+      io.rancher.container.pull_image: always
+      traefik.frontend.rule: Host:${DOMAINS}
+      traefik.backend: ${TRAEFIK_BACKEND}
+      traefik.enable: true
+      traefik.port: 8081
+
+volumes:
+  molgenis-nexus:
+    driver: local

templates/nexus/0/rancher-compose.yml

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+.catalog:
+  name: nexus
+  version: latest
+  description: Nexus for Molgenis
+  minimum_rancher_version: v1.6.3
+
+  start_on_create: true
+  scale: 1
+  health_check:
+    port: 8080
+    interval: 5000
+    unhealthy_threshold: 3
+    request_line: 'GET / HTTP/1.0'
+    healthy_threshold: 2
+    response_timeout: 5000