Set up basic CI

.drone.yml

@@ -10,26 +10,8 @@ services:
       POSTGRES_PASSWORD: postgres
 
 steps:
-  - name: restore_cache
-    # the `plugins` user seems to be owned by the drone organization
-    image: docker.io/plugins/cache:1.9
-    pull: true
-    settings:
-      backend: "filesystem"
-      restore: true
-      cache_key: "volume"
-      archive_format: "gzip"
-      # filesystem_cache_root: "/tmp/cache"
-      mount:
-        - "_build"
-    volumes:
-      - name: cache
-        path: /tmp/cache
-
   - name: check
     image: docker.io/library/elixir:1.18.3-otp-27
-    depends_on:
-      - restore_cache
     commands:
       # Install hex package manager
       - mix local.hex --force
@@ -66,9 +48,7 @@ steps:
 
   - name: test
     image: docker.io/library/elixir:1.18.3-otp-27
-    depends_on:
-      - restore_cache
-      # - wait_for_postgres
+      - wait_for_postgres
     environment:
       MIX_ENV: test
       TEST_POSTGRES_HOST: postgres