Add Cachet OCA (#257)

* Add Cachet OCA

* Implement feedback (@githubsaturn)

public/v4/apps/cachet.yml

@@ -0,0 +1,54 @@
+captainVersion: 4
+services:
+    $$cap_appname-postgres:
+        image: postgres:12-alpine
+        environment:
+            POSTGRES_USER: postgres
+            POSTGRES_PASSWORD: $$cap_DB_PASS
+        volumes:
+            - $$cap_appname-postgres-data:/var/lib/postgresql/data
+        caproverExtra:
+            notExposeAsWebApp: 'true'
+    $$cap_appname:
+        image: cachethq/docker:$$cap_cachet_version
+        environment:
+            DB_DRIVER: pgsql
+            DB_HOST: srv-captain--$$cap_appname-postgres
+            DB_PORT: 5432
+            DB_DATABASE: postgres
+            DB_USERNAME: postgres
+            DB_PASSWORD: $$cap_DB_PASS
+            DB_PREFIX: chq_
+            APP_KEY: $$cap_gen_random_hex(32)
+            APP_LOG: errorlog
+            APP_ENV: production
+            APP_DEBUG: false
+            DEBUG: false
+        restart: always
+        caproverExtra:
+            containerHttpPort: '8000'
+caproverOneClickApp:
+    variables:
+        - label: Database Password
+          description: Password to connect to the database
+          defaultValue: $$cap_gen_random_hex(16)
+          id: $$cap_DB_PASS
+        - id: $$cap_cachet_version
+          label: Version Tag
+          description: Check out their Docker page for the valid tags https://hub.docker.com/r/cachethq/docker/tags
+          defaultValue: '2.3.15'
+    instructions:
+        start: |-
+            📛 An open source status page system for everyone.
+
+            GitHub: https://github.com/CachetHQ/Cachet
+        end: |-
+            Aaaand you're done! 😄
+
+            Your service is available at http://$$cap_appname.$$cap_root_domain
+
+            If you need help with installation check out the docs! https://docs.cachethq.io/docs
+    displayName: Cachet
+    isOfficial: true
+    description: An open source status page system for everyone.
+    documentation: https://docs.cachethq.io/docs