Add caching for ci clang install (#168)

Author: speedyleion

.github/workflows/pythonpackage.yml

@@ -19,10 +19,17 @@ jobs:
         run: |
           VERSION=${{ matrix.python-version }}
           echo "environment=${VERSION//.}" >> $GITHUB_OUTPUT
+      - name: Cache LLVM and Clang
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: llvm/lib/libclang.so*
+          key: llvm-16
       - name: Install LLVM and Clang
         uses: KyleMayes/install-llvm-action@v1
         with:
           version: "16.0"
+          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
       - name: Symlink libclang.so
         run: sudo ln -s ${{ env.LLVM_PATH }}/lib/libclang.so /usr/lib/x86_64-linux-gnu/libclang-16.so
       - name: Install dependencies
@@ -37,10 +44,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Cache LLVM and Clang
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: llvm/lib/libclang.so*
+          key: llvm-16
       - name: Install LLVM and Clang
         uses: KyleMayes/install-llvm-action@v1
         with:
           version: "16.0"
+          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
       - name: Symlink libclang.so
         run: sudo ln -s ${{ env.LLVM_PATH }}/lib/libclang.so /usr/lib/x86_64-linux-gnu/libclang-16.so
       - name: Install dependencies
@@ -61,10 +75,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Cache LLVM and Clang
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: llvm/lib/libclang.so*
+          key: llvm-16
       - name: Install LLVM and Clang
         uses: KyleMayes/install-llvm-action@v1
         with:
           version: "16.0"
+          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
       - name: Symlink libclang.so
         run: sudo ln -s ${{ env.LLVM_PATH }}/lib/libclang.so /usr/lib/x86_64-linux-gnu/libclang-16.so
       - name: Install dependencies
@@ -81,10 +102,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Cache LLVM and Clang
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: llvm/lib/libclang.so*
+          key: llvm-16
       - name: Install LLVM and Clang
         uses: KyleMayes/install-llvm-action@v1
         with:
           version: "16.0"
+          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
       - name: Symlink libclang.so
         run: sudo ln -s ${{ env.LLVM_PATH }}/lib/libclang.so /usr/lib/x86_64-linux-gnu/libclang-16.so
       - name: Install dependencies