chore: update backup configurations and directory structure

- Modified `.gitignore` to exclude all files in the `/data/` directory.
- Enhanced `BACKUP.md` with customization options for backup storage paths and updated database path configurations.
- Updated `docker-compose.yml` to reflect new paths for database and backup storage.
- Adjusted `Dockerfile` to create a dedicated backups directory.
- Refactored `BackupService` to utilize environment variables for backup paths, improving flexibility and reliability.
- Deleted `dev.db` as it is no longer needed in the repository.

Dockerfile

@@ -35,8 +35,8 @@ RUN npm run build
 # Production image, copy all the files and run next
 FROM base AS runner
 
-# Set timezone to Europe/Paris
-RUN apk add --no-cache tzdata
+# Set timezone to Europe/Paris and install sqlite3 for backups
+RUN apk add --no-cache tzdata sqlite
 RUN ln -snf /usr/share/zoneinfo/Europe/Paris /etc/localtime && echo Europe/Paris > /etc/timezone
 
 WORKDIR /app
@@ -64,8 +64,8 @@ COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 COPY --from=builder /app/prisma ./prisma
 COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma
 
-# Create data directory for SQLite
-RUN mkdir -p /app/data && chown nextjs:nodejs /app/data
+# Create data directory for SQLite and backups
+RUN mkdir -p /app/data/backups && chown -R nextjs:nodejs /app/data
 
 # Set all ENV vars before switching user
 ENV PORT=3000