feat: add pocketbase (#769)

* feat: add pocketbase

* fix(pocketbase): Docker and description fix-ups

Docker alpine image fixed removing "latest" label
Corrected length of description

* fix(pocketbase): Version label fix-ups

* fix(pocketbase): yml formatting issue fix-ups

public/v4/apps/pocketbase.yml

@@ -0,0 +1,41 @@
+captainVersion: 4
+
+services:
+    '$$cap_appname':
+        caproverExtra:
+            dockerfileLines:
+                - FROM alpine:3.16.2
+                - RUN apk add --no-cache unzip openssh
+                - ADD https://github.com/pocketbase/pocketbase/releases/download/v$$cap_version/pocketbase_$$cap_version_linux_amd64.zip /tmp/pb.zip
+                - RUN unzip /tmp/pb.zip -d /pb/
+                - EXPOSE 8080
+                - CMD ["/pb/pocketbase", "serve", "--http=0.0.0.0:8080"]
+            containerHttpPort: '8080'
+        volumes:
+            - '$$cap_appname-data:/pb/pb_data'
+
+caproverOneClickApp:
+    variables:
+        - id: '$$cap_version'
+          label: PocketBase Version
+          defaultValue: '0.7.9'
+          description: Check out their Docker page for the valid tags https://github.com/pocketbase/pocketbase/releases
+          validRegex: "/^([^\\s^\\/])+$/"
+    instructions:
+        start: |-
+            PocketBase is an open source Go backend:
+            - embedded database (SQLite) with realtime subscriptions
+            - built-in files and users management
+            - convenient Admin dashboard UI
+            - and simple REST-ish API
+        end: |-
+            PocketBase has been successfully deployed!
+    displayName: PocketBase
+    isOfficial: true
+    description: |-
+        PocketBase is an open source Go backend: 
+        - embedded database (SQLite) with realtime subscriptions
+        - built-in files and users management
+        - convenient Admin dashboard UI
+        - and simple REST-ish API
+    documentation: See https://pocketbase.io/