feat(ci): use slim image with parallel steps

Also, install git and make in every step.

.drone.yml

@@ -36,64 +36,82 @@ steps:
       region: us-east-1
       restore: true
 
-  - name: get dependencies
-    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
-      - mix do deps.get, deps.compile
-      - mix compile --force
-
   - name: test
-    image: *elixir
+    image: &elixir 'hexpm/elixir:1.17.2-erlang-27.0-debian-bookworm-20240701-slim'
     environment:
       MIX_ENV: test
       POSTGRES_HOST: &db_host db
       POSTGRES_USER: &db_user postgres
       POSTGRES_PASS: &db_pass postgres
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix test --cover --trace --slowest 10
+    depends_on:
+      - 'database healthecheck'
+      - 'restore cache'
 
   - name: compile app
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix compile --force --all-warnings --warnings-as-errors
+    depends_on:
+      - 'restore cache'
 
   - name: audit deps
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix hex.audit
       - mix deps.audit
       - mix deps.unlock --check-unused
       # - mix hex.outdated
+    depends_on:
+      - 'restore cache'
 
   - name: format check
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix format --dry-run --check-formatted
+    depends_on:
+      - 'restore cache'
 
   - name: credo check
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix credo suggest --strict --format=flycheck
+    depends_on:
+      - 'restore cache'
 
   - name: dialyzer check
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix dialyzer --no-check --quiet --ignore-exit-status --format short
+    depends_on:
+      - 'restore cache'
 
   - name: sobelow check
     image: *elixir
     commands:
-      - mix do local.rebar --force, local.hex --force
+      - apt-get update
+      - apt-get install -y git make
+      - mix do local.rebar --force, local.hex --force, deps.get, deps.compile
       - mix sobelow
+    depends_on:
+      - 'restore cache'
 
   - name: rebuild cache
     image: *drone_cache
@@ -114,6 +132,14 @@ steps:
       path_style: true
       rebuild: true
       region: us-east-1
+    depends_on:
+      - 'test'
+      - 'compile app'
+      - 'audit deps'
+      - 'format check'
+      - 'credo check'
+      - 'dialyzer check'
+      - 'sobelow check'
 
 services:
   - name: *db_host