Investigate cargo-chef to cache things

.github/workflows/build.yml

@@ -10,17 +10,11 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
-    env:
-      RUNNER_TOOL_CACHE: /toolcache
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
 
-# Note to self: maybe look at this if we want to build outside docker?
-#      - name: Build with cache
-#        uses: Swatinem/rust-cache@v2
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
@@ -36,6 +30,7 @@ jobs:
         with:
           context: .
           push: true
+          file: ./Dockerfile.cache
           tags: git.joshuacoles.me/personal/monzo-ingestion:latest
           cache-from: type=registry,ref=user/app:latest
           cache-to: type=inline