fix: pass git commit hash to Docker build via build-arg

Dockerfile

@@ -4,7 +4,7 @@
 FROM node:20-alpine AS builder
 
 # Install dependencies
-RUN apk add --no-cache python3 make g++ git
+RUN apk add --no-cache python3 make g++
 
 # Set working directory
 WORKDIR /app
@@ -18,15 +18,13 @@ RUN npm ci
 # Copy source code
 COPY . .
 
-# Get git commit hash
-RUN GIT_COMMIT_HASH=$(git rev-parse --short HEAD) && echo "GIT_COMMIT_HASH=$GIT_COMMIT_HASH" > .env
-
 # Generate Prisma client (with dummy PostgreSQL DATABASE_URL for build-time generation)
 # Note: A dummy URL is used since the real database is not available during build
 RUN DATABASE_URL="postgresql://user:pass@localhost:5432/dummy" npx prisma generate
 
 # Build the application (with dummy DATABASE_URL for static page generation and git commit)
-RUN DATABASE_URL="postgresql://user:pass@localhost:5432/dummy" NEXT_PUBLIC_GIT_COMMIT=$(git rev-parse --short HEAD) npm run build
+ARG GIT_COMMIT=unknown
+RUN DATABASE_URL="postgresql://user:pass@localhost:5432/dummy" NEXT_PUBLIC_GIT_COMMIT=$GIT_COMMIT npm run build
 
 # Stage 2: Runner
 FROM node:20-alpine AS runner

justfile

@@ -85,11 +85,11 @@ seed:
 # Build the Docker image (standard build)
 docker-build:
     @echo "Building Docker image {{PROJECT}}:{{IMAGE_TAG}}..."
-    docker build -t {{PROJECT}}:{{IMAGE_TAG}} .
+    docker build --build-arg GIT_COMMIT={{GIT_COMMIT}} -t {{PROJECT}}:{{IMAGE_TAG}} .
 
 docker-build-commit:
     @echo "Building Docker image {{PROJECT}}:{{IMAGE_TAG_COMMIT}}..."
-    docker build -t {{PROJECT}}:{{IMAGE_TAG_COMMIT}} .
+    docker build --build-arg GIT_COMMIT={{GIT_COMMIT}} -t {{PROJECT}}:{{IMAGE_TAG_COMMIT}} .
 
 # Build and tag with both latest and commit hash
 docker-build-full: docker-build docker-build-commit
@@ -99,6 +99,7 @@ docker-build-full: docker-build docker-build-commit
 docker-rebuild-fast:
     @echo "Fast rebuilding Docker image {{PROJECT}}:{{IMAGE_TAG}}..."
     DOCKER_BUILDKIT=1 docker build \
+        --build-arg GIT_COMMIT={{GIT_COMMIT}} \
         --cache-from={{PROJECT}}:{{IMAGE_TAG}} \
         -t {{PROJECT}}:{{IMAGE_TAG}} \
         -t {{PROJECT}}:{{IMAGE_TAG_COMMIT}} \