chore: reorder drone steps for speed improvements

.drone.yml

@@ -28,33 +28,24 @@ steps:
       restore: true
       mount:
         - ./deps
-        - ./_build
+        - ./.hex-cache
       ttl: 30
     volumes:
       - name: cache
         path: /cache
 
-  - name: lint
+  - name: setup
     image: docker.io/library/elixir:1.18.3-otp-27
+    depends_on:
+      - restore-cache
+    environment:
+      HEX_HOME: ./.hex-cache
+      MIX_HOME: ./.hex-cache
     commands:
-      # Install hex package manager
+      # Install hex package manager (uses cached .hex-cache if available)
       - mix local.hex --force
       # Fetch dependencies
       - mix deps.get
-      # Check for compilation errors & warnings
-      - mix compile --warnings-as-errors
-      # Check formatting
-      - mix format --check-formatted
-      # Security checks
-      - mix sobelow --config
-      # Check dependencies for known vulnerabilities
-      - mix deps.audit
-      # Check for dependencies that are not maintained anymore
-      - mix hex.audit
-      # Provide hints for improving code quality
-      - mix credo
-      # Check that translations are up to date
-      - mix gettext.extract --check-up-to-date
 
   - name: wait_for_postgres
     image: docker.io/library/postgres:17.6
@@ -72,30 +63,70 @@ steps:
         echo "Postgres did not become available, aborting."
         exit 1
 
+  - name: compile
+    image: docker.io/library/elixir:1.18.3-otp-27
+    depends_on:
+      - setup
+    environment:
+      HEX_HOME: ./.hex-cache
+      MIX_HOME: ./.hex-cache
+    commands:
+      # Compile for dev (with warnings as errors) and test environments
+      - mix compile --warnings-as-errors
+      - MIX_ENV=test mix compile --warnings-as-errors
+
+  - name: lint
+    image: docker.io/library/elixir:1.18.3-otp-27
+    depends_on:
+      - compile
+    environment:
+      HEX_HOME: ./.hex-cache
+      MIX_HOME: ./.hex-cache
+    commands:
+      # Check formatting
+      - mix format --check-formatted
+      # Security checks
+      - mix sobelow --config
+      # Check dependencies for known vulnerabilities
+      - mix deps.audit
+      # Check for dependencies that are not maintained anymore
+      - mix hex.audit
+      # Provide hints for improving code quality
+      - mix credo
+      # Check that translations are up to date
+      - mix gettext.extract --check-up-to-date
+
   - name: test
     image: docker.io/library/elixir:1.18.3-otp-27
+    depends_on:
+      - compile
+      - wait_for_postgres
     environment:
       MIX_ENV: test
       TEST_POSTGRES_HOST: postgres
       TEST_POSTGRES_PORT: 5432
+      HEX_HOME: ./.hex-cache
+      MIX_HOME: ./.hex-cache
     commands:
-      # Install hex package manager
-      - mix local.hex --force
-      # Fetch dependencies
-      - mix deps.get
-      # Run tests
-      - mix test
+      # Run tests with increased parallelism
+      - mix test --max-cases 16
 
   - name: rebuild-cache
     image: drillster/drone-volume-cache
+    depends_on:
+      - lint
+      - test
     settings:
       rebuild: true
       mount:
         - ./deps
-        - ./_build
+        - ./.hex-cache
     volumes:
       - name: cache
         path: /cache
+    when:
+      status:
+        - success
 
 volumes:
   - name: cache