migrate to v4

public/v4/apps/photoprism.yml

@@ -0,0 +1,23 @@
+captainVersion: 4
+services:
+  $$cap_appname:
+    image: photoprism/photoprism:$$cap_photoprism_version
+    volumes:
+      - $$cap_appname-data:/photoprism/originals/
+    restart: always
+    caproverExtra:
+      containerHttpPort: "2342"
+caproverOneClickApp:
+  variables:
+    - id: $$cap_photoprism_version
+      label: Photoprism Version
+      defaultValue: "20200427"
+      description: Check out their Docker page for the valid tags https://hub.docker.com/r/photoprism/photoprism/tags
+      validRegex: /^([^\s^\/])+$/
+  instructions:
+    start: PhotoPrism is a server-based application for browsing, organizing and sharing your personal photo collection. It makes use of the latest technologies to automatically tag and find pictures without getting in your way.
+    end: Photoprism is deployed and available as $$cap_appname. Please also enable Websockets in the Caprover UI. When you log in the default password is 'photoprism'
+  displayName: Photoprism
+  isOfficial: true
+  description: An app for browsing, organizing and sharing your personal photo collection.
+  documentation: Taken from https://hub.docker.com/r/photoprism/photoprism