Slim down housekeeping

Author: rrrene

.github/workflows/housekeeping-regression.yml

@@ -20,11 +20,4 @@ jobs:
         with:
           otp-version: 27.3
           elixir-version: 1.18.4
-      - run: mix deps.get
-      - run: mix credo --mute-exit-status
-      - run: mkdir tmp
-      - run: head --lines=3 test/old_credo.exs
-      - run: elixir test/old_credo.exs
-      - run: elixir test/old_credo.exs > tmp/old_credo.txt
-      - run: mix credo --mute-exit-status --strict --enable-disabled-checks .+ --no-color --format oneline > tmp/new_credo.txt
-      - run: diff tmp/old_credo.txt tmp/new_credo.txt
+      - run: ./test/run_on_old_credo.sh

.github/workflows/housekeeping.yml

@@ -22,7 +22,7 @@ jobs:
           elixir-version: 1.19.4
       - run: mix deps.get
       - run: mix compile
-      - run: ./test/check_formatted.sh
+      - run: mix format --check-formatted
 
   trigger:
     name: "tested that for each check there is at least one trigger assertion"