support the new shared compilation cache directory

.github/actions/cache-query-compilation/action.yml

@@ -27,7 +27,9 @@ runs:
       if: ${{ github.event_name == 'pull_request' }}
       uses: actions/cache/restore@v3
       with:
-        path: '**/.cache'
+        path: |
+          **/.cache
+          ~/.codeql/compile-cache
         key: codeql-compile-${{ inputs.key }}-pr-${{ github.sha }}
         restore-keys: |
           codeql-compile-${{ inputs.key }}-${{ github.base_ref }}-${{ env.merge_base }}
@@ -37,7 +39,9 @@ runs:
       if: ${{ github.event_name != 'pull_request' }}
       uses: actions/cache@v3
       with:
-        path: '**/.cache'
+        path: |
+          **/.cache
+          ~/.codeql/compile-cache
         key: codeql-compile-${{ inputs.key }}-${{ github.ref_name }}-${{ github.sha }} # just fill on main
         restore-keys: | # restore the latest cache if the exact cache is unavailable, to speed up compilation.
           codeql-compile-${{ inputs.key }}-${{ github.ref_name }}-
@@ -66,6 +70,7 @@ runs:
 
           const fs = require("fs");
           const path = require("path");
+          const os = require("os");
 
           // the first argv is the cache folder to create.
           const COMBINED_CACHE_DIR = process.env.COMBINED_CACHE_DIR;
@@ -105,6 +110,17 @@ runs:
               console.log(`Found .cache dir at ${dir}`);
             }
 
+            const globalCacheDir = path.join(os.homedir(), ".codeql", "compile-cache");
+            if (fs.existsSync(globalCacheDir)) {
+              console.log("Found global home dir: " + globalCacheDir);
+              cacheDirs.push(globalCacheDir);
+            }
+
+            if (cacheDirs.length === 0) {
+              console.log("No cache dirs found");
+              return;
+            }
+
             // mkdir -p ${COMBINED_CACHE_DIR}
             fs.mkdirSync(COMBINED_CACHE_DIR, { recursive: true });