Add CI cache

.drone.yml

@@ -14,6 +14,26 @@ trigger:
     - push
 
 steps:
+  - name: compute cache key
+    image: docker.io/library/elixir:1.18.3-otp-27
+    commands:
+      - echo "$DRONE_REPO_OWNER/$DRONE_REPO_NAME/" >> .cache_key
+      - echo $(sha256sum mix.lock) >> .cache_key
+      # Print cache key for debugging
+      - cat .cache_key
+
+  - name: restore-cache
+    image: drillster/drone-volume-cache
+    settings:
+      restore: true
+      mount:
+        - ./deps
+        - ./_build
+      ttl: 30
+    volumes:
+      - name: cache
+        path: /tmp/cache
+
   - name: lint
     image: docker.io/library/elixir:1.18.3-otp-27
     commands:
@@ -50,18 +70,33 @@ steps:
         echo "Postgres did not become available, aborting."
         exit 1
 
-  - name: test
-    image: docker.io/library/elixir:1.18.3-otp-27
-    environment:
-      MIX_ENV: test
-      TEST_POSTGRES_HOST: postgres
-    commands:
-      # Install hex package manager
-      - mix local.hex --force
-      # Fetch dependencies
-      - mix deps.get
-      # Run tests
-      - mix test
+  # - name: test
+  #   image: docker.io/library/elixir:1.18.3-otp-27
+  #   environment:
+  #     MIX_ENV: test
+  #     TEST_POSTGRES_HOST: postgres
+  #   commands:
+  #     # Install hex package manager
+  #     - mix local.hex --force
+  #     # Fetch dependencies
+  #     - mix deps.get
+  #     # Run tests
+  #     - mix test
+
+  - name: rebuild-cache
+    image: drillster/drone-volume-cache
+    settings:
+      rebuild: true
+      mount:
+        - ./deps
+    volumes:
+      - name: cache
+        path: /tmp/cache
+
+volumes:
+  - name: cache
+    host:
+      path: /tmp/drone_cache
 
 ---
 kind: pipeline