Fix CI - completely removing cache to fix issues.

Nuclear option to fix CI issues. Removing all cache to ensure that no
old files are causing problems. This will result in longer build times
for the next few builds, but should resolve the issues we're facing.

Author: Sebastijan-Dominis

.github/workflows/tests.yml

@@ -7,23 +7,25 @@ on:
 
 jobs:
   tests:
-    if: "!contains(github.event.head_commit.message, '[skip ci]')"
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
+      # Nuke everything: remove cached Conda environment and Conda package cache
       - name: Remove existing Conda environment
         run: conda env remove -n hotel_management || true
 
-      - name: Cache Conda packages
-        uses: actions/cache@v4
-        with:
-          path: ~/conda_pkgs_dir
-          key: ${{ runner.os }}-conda-pkgs-${{ hashFiles('environment.yml') }}
-          restore-keys: |
-            ${{ runner.os }}-conda-pkgs-
+      - name: Remove Conda package cache
+        run: rm -rf ~/conda_pkgs_dir || true
+
+      # Remove any old Python bytecode
+      - name: Remove Python caches
+        run: |
+          find . -type d -name "__pycache__" -exec rm -rf {} +
+          find . -name "*.pyc" -delete
 
+      # Recreate environment completely
       - name: Set up conda
         uses: conda-incubator/setup-miniconda@v2
         with:
@@ -33,16 +35,10 @@ jobs:
           use-mamba: true
           auto-activate-base: false
 
-      - name: Clear Python caches
-        run: |
-          find . -type d -name "__pycache__" -exec rm -rf {} +
-          find . -name "*.pyc" -delete
-
-      - name: Set PYTHONPATH
-        run: echo "PYTHONPATH=${{ github.workspace }}" >> $GITHUB_ENV
-
+      # Install the package in editable mode
       - name: Install package in editable mode
         run: conda run -n hotel_management pip install -e .
 
+      # Run tests with coverage
       - name: Run tests with coverage
         run: conda run -n hotel_management coverage run -m pytest -v --maxfail=1 --disable-warnings