feat: Implement Docker version reporting by extracting git tag to an environment variable for API consumption.

Dockerfile

@@ -13,9 +13,16 @@ RUN npm ci
 # Rebuild the source code only when needed
 FROM base AS builder
 WORKDIR /app
+
+# Install git to extract version information
+RUN apk add --no-cache git
+
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 
+# Extract version from git
+RUN git describe --tags --always 2>/dev/null > /tmp/version.txt || echo "unknown" > /tmp/version.txt
+
 # Next.js collects completely anonymous telemetry data about general usage.
 # Learn more here: https://nextjs.org/telemetry
 # Uncomment the following line in case you want to disable telemetry during the build.
@@ -53,6 +60,9 @@ COPY --from=builder --chown=nextjs:nodejs /app/node_modules ./node_modules
 # Create uploads directory and set permissions
 RUN mkdir -p public/uploads/covers && chown -R nextjs:nodejs public/uploads
 
+# Copy version file from builder
+COPY --from=builder /tmp/version.txt /app/version.txt
+
 USER nextjs
 
 EXPOSE 3000