chore: cache multiple stages

.github/workflows/docker.yml

@@ -42,6 +42,22 @@ jobs:
           tags: ghcr.io/uetchy/uechi.io:latest
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new
+
+      - name: Cache deps stage
+        uses: docker/build-push-action@v2
+        with:
+          target: deps
+          tags: deps_stage
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
+
+      - name: Cache build stage
+        uses: docker/build-push-action@v2
+        with:
+          target: build
+          tags: build_stage
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
           
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:15 as build
+FROM node:15 as deps
 
 # https://github.com/jgm/pandoc/releases
 RUN curl -LO https://github.com/jgm/pandoc/releases/download/2.14.0.1/pandoc-2.14.0.1-1-amd64.deb
@@ -7,6 +7,9 @@ RUN dpkg -i pandoc-2.14.0.1-1-amd64.deb
 WORKDIR /app
 COPY package.json /app
 RUN yarn install
+
+FROM deps as build
+
 COPY themes /app/themes
 COPY source /app/source
 COPY _config.yml /app/