Postgres: Add docker-compose.postgres.yml, see #47

Postgres support additionally requires a GORM upgrade to 2.0 (v1.20) as the current version doesn't support generic column types like "bytes" (VARBINARY in MySQL, different in Postgres and other SQL dialects).

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

docker-compose.postgres.yml

@@ -0,0 +1,69 @@
+version: '3.5'
+
+services:
+  photoprism:
+    build: .
+    image: photoprism/photoprism:develop
+    security_opt:
+      - seccomp:unconfined
+      - apparmor:unconfined
+    depends_on:
+      - postgres
+    ports:
+      - "2342:2342" # Web Server (PhotoPrism)
+      - "2343:2343" # Acceptance Tests
+    volumes:
+      - ".:/go/src/github.com/photoprism/photoprism"
+      - "go-mod:/go/pkg/mod"
+    shm_size: "2gb"
+    environment:
+      TF_CPP_MIN_LOG_LEVEL: 0 # Show TensorFlow log messages for development
+      PHOTOPRISM_SITE_URL: "http://localhost:2342/"
+      PHOTOPRISM_SITE_TITLE: "PhotoPrism"
+      PHOTOPRISM_SITE_CAPTION: "Browse Your Life"
+      PHOTOPRISM_SITE_DESCRIPTION: "Open-Source Personal Photo Management"
+      PHOTOPRISM_SITE_AUTHOR: "@browseyourlife"
+      PHOTOPRISM_DEBUG: "true"
+      PHOTOPRISM_READONLY: "false"
+      PHOTOPRISM_PUBLIC: "true"
+      PHOTOPRISM_EXPERIMENTAL: "true"
+      PHOTOPRISM_UPLOAD_NSFW: "false"
+      PHOTOPRISM_DETECT_NSFW: "false"
+      PHOTOPRISM_SERVER_MODE: "debug"
+      PHOTOPRISM_HTTP_HOST: "0.0.0.0"
+      PHOTOPRISM_HTTP_PORT: 2342
+      PHOTOPRISM_DATABASE_DRIVER: "postgres"
+      PHOTOPRISM_DATABASE_DSN: "user=photoprism password=photoprism dbname=photoprism host=postgres port=5432 sslmode=disable TimeZone=UTC"
+      PHOTOPRISM_TEST_DRIVER: "sqlite"
+      PHOTOPRISM_TEST_DSN: ".test.db"
+      PHOTOPRISM_ADMIN_PASSWORD: "photoprism"
+      PHOTOPRISM_ASSETS_PATH: "/go/src/github.com/photoprism/photoprism/assets"
+      PHOTOPRISM_STORAGE_PATH: "/go/src/github.com/photoprism/photoprism/storage"
+      PHOTOPRISM_ORIGINALS_PATH: "/go/src/github.com/photoprism/photoprism/storage/originals"
+      PHOTOPRISM_IMPORT_PATH: "/go/src/github.com/photoprism/photoprism/storage/import"
+      PHOTOPRISM_THUMB_FILTER: "lanczos"    # Resample filter, best to worst: blackman, lanczos, cubic, linear
+      PHOTOPRISM_THUMB_UNCACHED: "true"     # Enable on-demand thumbnail rendering (high memory and cpu usage)
+      PHOTOPRISM_THUMB_SIZE: 2048           # Pre-rendered thumbnail size limit (default 2048, min 720, max 7680)
+      # PHOTOPRISM_THUMB_SIZE: 4096         # Retina 4K, DCI 4K (requires more storage); 7680 for 8K Ultra HD
+      PHOTOPRISM_THUMB_SIZE_UNCACHED: 7680  # On-demand rendering size limit (default 7680, min 720, max 7680)
+      PHOTOPRISM_JPEG_SIZE: 7680            # Size limit for converted image files in pixels (720-30000)
+      PHOTOPRISM_JPEG_QUALITY: 92           # Set to 95 for high-quality thumbnails (25-100)
+      PHOTOPRISM_DARKTABLE_PRESETS: "false" # Use darktable presets (disables concurrent raw to jpeg conversion)
+      PHOTOPRISM_SIDECAR_JSON: "true"       # Read metadata from JSON sidecar files created by exiftool
+      PHOTOPRISM_SIDECAR_YAML: "true"       # Backup photo metadata to YAML sidecar files
+
+  postgres:
+    image: postgres:12-alpine
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_DB: photoprism
+      POSTGRES_USER: photoprism
+      POSTGRES_PASSWORD: photoprism
+
+  webdav-dummy:
+    image: photoprism/webdav:20200825
+
+volumes:
+  go-mod:
+    driver: local

internal/config/params.go

@@ -17,6 +17,7 @@ import (
 const (
 	MySQL  = "mysql"
 	SQLite = "sqlite3"
+	// Postgres = "postgres" // TODO: Requires GORM 2.0 for generic column data types
 )
 
 // Params provides a struct in which application configuration is stored.