Add dependency-graph-continue-on-failure input param

- Translate to env var for init-script support
- Use when deciding whether to log or rethrow errors
- Add a custom error type to trigger failure in post action

src/post.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core'
 import * as setupGradle from './setup-gradle'
+import {PostActionJobFailure} from './errors'
 
 // Catch and log any unhandled exceptions.  These exceptions can leak out of the uploadChunk method in
 // @actions/toolkit when a failed upload closes the file descriptor causing any in-process reads to
@@ -13,6 +14,11 @@ export async function run(): Promise<void> {
     try {
         await setupGradle.complete()
     } catch (error) {
+        if (error instanceof PostActionJobFailure) {
+            core.setFailed(String(error))
+            return
+        }
+
         handleFailure(error)
     }
 }