Add Gitea backup/restore scripts, parameterize configs

- Add gitea/backup.sh and gitea/restore.sh
- Move hardcoded values in gitea/docker-compose.yml to gitea/.env
- Move immich .env from root to immich-app/, update env_file path
- Remove root docker-compose.yml (was only an include alias)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gitea/docker-compose.yml

@@ -1,5 +1,3 @@
-version: "3"
-
 networks:
   gitea:
     external: false
@@ -13,15 +11,16 @@ services:
       - USER_GID=1001
       - GITEA__database__DB_TYPE=postgres
       - GITEA__database__HOST=db:5432
-      - GITEA__database__NAME=gitea
-      - GITEA__database__USER=gitea
-      - GITEA__database__PASSWD=gitea
+      - GITEA__database__NAME=${DB_NAME}
+      - GITEA__database__USER=${DB_USER}
+      - GITEA__database__PASSWD=${DB_PASSWORD}
     restart: always
     networks:
       - gitea
     volumes:
-      - /home/git/.ssh/:/data/git/.ssh
-      - /mnt/misc/gitea:/data
+      - ${SSH_KEY_PATH}:/data/git/.ssh
+      - ${GITEA_DATA}:/data
+      - ${BACKUP_DIR}:/backup
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
     ports:
@@ -34,10 +33,10 @@ services:
     image: docker.io/library/postgres:14
     restart: always
     environment:
-      - POSTGRES_USER=gitea
-      - POSTGRES_PASSWORD=gitea
-      - POSTGRES_DB=gitea
+      - POSTGRES_USER=${DB_USER}
+      - POSTGRES_PASSWORD=${DB_PASSWORD}
+      - POSTGRES_DB=${DB_NAME}
     networks:
       - gitea
     volumes:
-      - ./postgres:/var/lib/postgresql/data
+      - ${DB_DATA_LOCATION}:/var/lib/postgresql/data