bugfix: use core.isDebug in combination with info for debug logging

It seems that `core.debug` is not fully functional.

```shell
TypeError: Cannot read properties of undefined (reading 'debug')
    at Object.debug (/action/main.js:2:61257)
    at t.App.validateJsonSchema (/action/main.js:2:63500)
    at t.App.projectContainsValidJsonConfiguration (/action/main.js:2:64504)
    at t.App.assertSanityChecksArePassing (/action/main.js:2:63051)
    at /action/main.js:2:99054
    at /action/main.js:2:100228
    at Object.<anonymous> (/action/main.js:2:100232)
    at Module._compile (node:internal/modules/cjs/loader:1099:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
```

Signed-off-by: Maximilian Bösing <[email protected]>

Author: boesing

src/action/github.ts

@@ -4,6 +4,7 @@ import {Output} from '../config/output';
 import {Logger} from '../logging';
 
 export class Github implements Action {
+
     publish(variable: string, output: Output): void {
         core.setOutput(variable, JSON.stringify(output));
     }
@@ -16,7 +17,10 @@ export class Github implements Action {
     getLogger(): Logger {
         return {
             debug(message: string): void {
-                core.debug(message);
+                if (!core.isDebug()) {
+                    return;
+                }
+                core.info(message);
             },
 
             info(message: string): void {