feat: cache docker image layers too

.github/pull_request_template.md

@@ -10,14 +10,14 @@ conda_forge_tick/models appropriately and document any new fields or files. Tick
 Note that the model exists next to and independent of the actual production code.
 -->
 
-### Description
+#### Description:
 
 <!-- Please describe your PR here. -->
 
-### Checklist
+#### Checklist:
 
 - [ ] Pydantic model updated or no update needed
 
-### Cross-refs, links to issues, etc
+#### Cross-refs, links to issues, etc:
 
 <!-- Please cross-link your PR to any open issues, other PRs, etc. here. -->

.github/workflows/release.yml

@@ -61,7 +61,7 @@ jobs:
             type=raw,value=latest
 
       - name: build and push image
-        uses: docker/build-push-action@5176d81f87c23d6fc96624dfdbcd9f3830bbe445 # v5
+        uses: docker/build-push-action@16ebe778df0e7752d2cfcbd924afdbbd89c1a755 # v6
         with:
           context: .
           push: true

.github/workflows/tests.yml

@@ -73,9 +73,18 @@ jobs:
         env:
           MONGODB_CONNECTION_STRING: "mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000"
 
+      - name: set up docker buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: build docker image
-        run: |
-          docker build -t ${{ env.IMAGE_NAME }}:test .
+        uses: docker/build-push-action@16ebe778df0e7752d2cfcbd924afdbbd89c1a755 # v6
+        with:
+          context: .
+          push: false
+          load: true
+          tags: ${{ env.IMAGE_NAME }}:test
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
       - name: restore test durations
         uses: actions/cache/restore@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9  # v4