CI: Upgrade setup pixi workflow action to latest version

CI: Revert to running on main and PR

bugfix CI: Preserve workflow version upgrade but there was an error in how the version was being injected

bugfix CI: No issue with the version as I thought, just an extra indentation in the yaml

bugfix: Returning to prevous versioning style after error message from CI...

CI: bugfix attempt. Only create cache on push to main and set the frozen parameter to be true

.github/workflows/deploy_docs.yaml

@@ -27,10 +27,16 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Install Pixi
-        uses: prefix-dev/setup-pixi@v0.4.3
+        uses: prefix-dev/setup-pixi@v0.5.1 
         with:
+<<<<<<< Updated upstream
+          pixi-version: ${{ env.PIXI_VERSION }} 
+=======
           pixi-version: ${{ env.PIXI_version }} 
+          frozen: true
+>>>>>>> Stashed changes
           cache: true
+          cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
 
       - name: Install repository
         run: |

.github/workflows/linter_check.yaml

@@ -4,6 +4,8 @@ name: Code Style Check
 
 on:
   push:
+    branches:
+      - main
   pull_request:
     types:
       - opened

.github/workflows/tests.yaml

@@ -1,8 +1,9 @@
 name: Install Python, pixi, and project
 
 on:
-  # Will run on push to every branch
   push:
+    branches:
+      - main
   pull_request:
     types:
       - opened
@@ -25,10 +26,10 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Install Pixi
-        uses: prefix-dev/setup-pixi@v0.4.3
+        uses: prefix-dev/setup-pixi@v0.5.1
         with:
           pixi-version: ${{ env.PIXI_version }} 
-          cache: false
+          cache: true
 
       - name: Install repository
         run: |