Automatic caching of dependencies

in a best effort manner by default
allowing to specify files to hash for computing the cache key

src/execution.ts

@@ -1,10 +1,13 @@
 import * as exec from '@actions/exec'
+import * as cacheDependencies from './cache-dependencies'
 
 export async function execute(
     executable: string,
     root: string,
     argv: string[]
 ): Promise<BuildResult> {
+    await cacheDependencies.restoreCachedDependencies(root)
+
     let publishing = false
     let buildScanUrl: string | undefined