Add Docker support and Gitea Actions workflow for container builds

Dockerfile

@@ -0,0 +1,78 @@
+# Mana Loop - Next.js Game Docker Image
+# Multi-stage build for optimized production image
+
+# Stage 1: Dependencies
+FROM node:20-alpine AS deps
+WORKDIR /app
+
+# Install dependencies for native modules
+RUN apk add --no-cache libc6-compat
+
+# Copy package files
+COPY package.json bun.lockb* ./
+COPY prisma ./prisma/
+
+# Install bun for faster installs
+RUN npm install -g bun
+
+# Install dependencies
+RUN bun install --frozen-lockfile --production=false
+
+# Stage 2: Builder
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Copy dependencies from deps stage
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Install bun for build
+RUN npm install -g bun
+
+# Set environment variables for build
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NODE_ENV=production
+
+# Generate Prisma client
+RUN bun run db:generate
+
+# Build the application
+RUN bun run build
+
+# Stage 3: Runner
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Create non-root user for security
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy necessary files from builder
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma
+COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
+
+# Set correct ownership
+RUN chown -R nextjs:nodejs /app
+
+# Switch to non-root user
+USER nextjs
+
+# Expose port
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000 || exit 1
+
+# Start the server
+CMD ["node", "server.js"]