ci: enable docker cache

.forgejo/workflows/ci.yml

@@ -52,5 +52,7 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           platforms: linux/amd64
           push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           build-args: |
             "release=1"

docker/Dockerfile

@@ -7,6 +7,7 @@ ARG release
 WORKDIR /invidious
 COPY ./shard.yml ./shard.yml
 COPY ./shard.lock ./shard.lock
+
 RUN shards install --production
 
 COPY ./src/ ./src/