fix container build

- install npm & postcss-cli in docker image
- match container build and non-container build hugo command

Dockerfile

@@ -14,7 +14,9 @@ RUN apk add --no-cache \
     openssh-client \
     rsync \
     build-base \
-    libc6-compat
+    libc6-compat \
+    npm && \
+    npm install -G autoprefixer postcss-cli
 
 ARG HUGO_VERSION
 

Makefile

@@ -64,7 +64,7 @@ container-image:
 		--build-arg HUGO_VERSION=$(HUGO_VERSION)
 
 container-build: module-check
-	$(CONTAINER_RUN) $(CONTAINER_IMAGE) hugo
+	$(CONTAINER_RUN) $(CONTAINER_IMAGE) hugo --minify
 
 container-serve: module-check
 	$(CONTAINER_RUN) --mount type=tmpfs,destination=/src/resources,tmpfs-mode=0755 -p 1313:1313 $(CONTAINER_IMAGE) hugo server --buildFuture --bind 0.0.0.0