fix(ci): use slim image and compile code on deps

.drone.yml

@@ -37,9 +37,12 @@ steps:
       restore: true
 
   - name: get dependencies
-    image: &elixir 'hexpm/elixir:1.17.2-erlang-27.0-debian-bookworm-20240701'
+    image: &elixir 'hexpm/elixir:1.17.2-erlang-27.0-debian-bookworm-20240701-slim'
     commands:
+      - apt-get update
+      - apt-get install -y git
       - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
+      - mix compile --force
     depends_on:
       - 'restore cache'
 
@@ -51,16 +54,15 @@ steps:
       POSTGRES_USER: &db_user postgres
       POSTGRES_PASS: &db_pass postgres
     commands:
-      - mix compile
       - mix test --cover --trace --slowest 10
     depends_on:
       - 'database healthcheck'
       - 'get dependencies'
 
   - name: compile app
-    image: &elixir 'hexpm/elixir:1.17.2-erlang-27.0-debian-bookworm-20240701'
+    image: *elixir
     commands:
-      - mix compile --all-warnings --warnings-as-errors
+      - mix compile --force --all-warnings --warnings-as-errors
     depends_on:
       - 'get dependencies'