Add Cal.com app (#854)

* Add Cal.com app

* Fixes formatting

public/v4/apps/call-only.yml

@@ -0,0 +1,80 @@
+captainVersion: 4
+services:
+    $$cap_appname:
+        image: calcom/cal.com:$$cap_version
+        restart: always
+        environment:
+            NODE_ENV: production
+            NEXT_PUBLIC_WEBAPP_URL: http://$$cap_appname.$$cap_root_domain
+            NEXTAUTH_SECRET: $$cap_secret_key_base
+            CALENDSO_ENCRYPTION_KEY: $$cap_calendso_encryption_key
+            POSTGRES_USER: $$cap_postgres_user
+            POSTGRES_PASSWORD: $$cap_postgres_password
+            POSTGRES_DB: $$cap_postgres_db
+            DATABASE_HOST: $$cap_postgres_host
+            DATABASE_URL: postgresql://$$cap_postgres_user:$$cap_postgres_password@$$cap_postgres_host/$$cap_postgres_db
+            GOOGLE_API_CREDENTIALS: '{}'
+            EMAIL_FROM: $$cap_email_from
+            EMAIL_SERVER_HOST: $$cap_email_host
+            EMAIL_SERVER_PORT: $$cap_email_server_password
+            EMAIL_SERVER_USER: $$cap_email_server_user
+            EMAIL_SERVER_PASSWORD: $$cap_email_server_password
+        caproverExtra:
+            containerHttpPort: '3000'
+caproverOneClickApp:
+    variables:
+        - id: $$cap_version
+          label: Cal.com Version
+          defaultValue: 'v2.5.4'
+          description: Check out their docker page for the valid tags https://hub.docker.com/r/calcom/cal.com/tags
+          validRegex: /^([^\s^\/])+$/
+        - id: $$cap_secret_key_base
+          label: Secret Key Base
+          description: The randomized string which is used to verify the integrity of signed cookies. Use `openssl rand -base64 32` to generate a key
+          defaultValue: secret
+        - id: $$cap_calendso_encryption_key
+          label: Secret Key Base
+          description: Encryption key that will be used to encrypt CalDAV credentials, choose a random string, for example with `dd if=/dev/urandom bs=1K count=1 | md5sum`
+          defaultValue: secret
+        - id: $$cap_postgres_user
+          label: Postgres user
+          defaultValue: user
+        - id: $$cap_postgres_password
+          label: Postgres password
+          defaultValue: password
+        - id: $$cap_postgres_db
+          label: Postgres db
+          defaultValue: calendso
+        - id: $$cap_postgres_host
+          label: Postgres host
+          defaultValue: database:5432
+        - id: $$cap_email_from
+          label: Emails from
+          defaultValue: notifications@example.com
+        - id: $$cap_email_host
+          label: Emails server host
+          defaultValue: smtp.example.com
+        - id: $$cap_email_port
+          label: Emails server port
+          defaultValue: '587'
+        - id: $$cap_email_server_user
+          label: Emails server user
+          defaultValue: email_user
+        - id: $$cap_email_server_password
+          label: Emails server password
+          defaultValue: email_password
+    instructions:
+        start: >-
+            The open-source Calendly alternative.
+        end: >-
+            Aaaand you're Cal.com is now successfully deployed! 😄
+
+            Please change the following settings before using the service: 
+            1. Go to the settings for `$$cap_appname`
+            2. Enable **Websocket Support**
+
+            Remember that this app will not create a Database by itself. You need to provide all that information.
+    displayName: 'Cal.com - No Database'
+    isOfficial: true
+    description: 'The open-source Calendly alternative.'
+    documentation: 'Read more at: https://github.com/calcom/cal.com'