Set up basic CI

.drone.yml

@@ -10,6 +10,22 @@ services:
       POSTGRES_PASSWORD: postgres
 
 steps:
+  - name: restore-cache-with-filesystem
+    # the `plugins` user seems to be owned by the drone organization
+    image: docker.io/library/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
     commands:
@@ -36,8 +52,8 @@ steps:
       # Wait for postgres to become available
       - |
         for i in {1..20}; do
-          if pg_isready -h postgres; then
+          if pg_isready -h postgres -u postgres; then
-            break
+            exit 0
           else
             true
           fi
@@ -51,8 +67,8 @@ steps:
     environment:
       MIX_ENV: test
       TEST_POSTGRES_HOST: postgres
-    depends_on:
+    # depends_on:
-      - wait for postgres
+    #   - wait for postgres
     commands:
       # Install hex package manager
       - mix local.hex --force