Add docker-compose for production deployment

- Add docker-compose.yml with app and postgres services
- Add .env.example with required environment variables
- Add .env to .gitignore to prevent committing secrets

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.env.example

@@ -0,0 +1,14 @@
+# LocalSpot Environment Configuration
+# Copy this file to .env and update the values
+
+# Required: Generate with `mix phx.gen.secret`
+SECRET_KEY_BASE=
+
+# Database configuration
+DATABASE_URL=postgres://postgres:postgres@db:5432/localspot
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_DB=localspot
+
+# Application host (your domain)
+PHX_HOST=localhost

.gitignore

@@ -35,3 +35,8 @@ localspot-*.tar
 npm-debug.log
 /assets/node_modules/
 
+# Environment files with secrets
+.env
+.env.local
+.env.*.local
+

docker-compose.yml

@@ -0,0 +1,49 @@
+# Docker Compose configuration for LocalSpot production deployment
+#
+# Usage:
+#   1. Copy .env.example to .env and configure your settings
+#   2. Run: docker compose up -d
+#
+# For first-time setup, run migrations:
+#   docker compose exec localspot /app/bin/migrate
+
+services:
+  localspot:
+    image: forgejo.sivic.me/kevinsivic/localspot:latest
+    # Or build locally:
+    # build: .
+    restart: unless-stopped
+    ports:
+      - "4000:4000"
+    environment:
+      - DATABASE_URL=${DATABASE_URL:-postgres://postgres:postgres@db:5432/localspot}
+      - SECRET_KEY_BASE=${SECRET_KEY_BASE}
+      - PHX_HOST=${PHX_HOST:-localhost}
+      - PORT=4000
+    depends_on:
+      db:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:4000/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+  db:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER:-postgres}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-postgres}
+      - POSTGRES_DB=${POSTGRES_DB:-localspot}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  postgres_data: