Add disk space cleanup action and integrate in CUDA workflow

Ignore unrelated file changes in CUDA workflow triggers to reduce
unnecessary runs

.github/actions/disk/action.yml

@@ -0,0 +1,15 @@
+---
+name: free disk space
+description: when rust compiling, free up some disk space
+
+runs:
+    using: composite
+    steps:
+        - name: free disk space
+          uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # 1.3.1
+          with:
+              android: true
+              dotnet: false
+              haskell: false
+              large-packages: false
+              swap-storage: false

.github/workflows/cuda-build.yml

@@ -5,9 +5,21 @@ on:
     push:
         branches:
             - cuda
+        paths-ignore:
+            - ".github/workflows/**"
+            - ".github/actions/**"
+            - "docs/**"
+            - "*.md"
+            - "LICENSE"
     pull_request:
         branches:
             - cuda
+        paths-ignore:
+            - ".github/workflows/**"
+            - ".github/actions/**"
+            - "docs/**"
+            - "*.md"
+            - "LICENSE"
 
 permissions:
     contents: read
@@ -23,6 +35,8 @@ jobs:
                 sm: ["86", "89", "120"]
 
         steps:
+            - uses: ./.github/actions/disk
+
             - name: Checkout repository
               uses: actions/checkout@v4