refactor: to node action (#47)

Refactoring the action from a composite to Node action. This change improves security through pinning of packages as well as better test-ability and error handling.

Reviewed-on: #47
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

.gitea/workflows/ci.yaml

@@ -13,10 +13,6 @@ jobs:
         uses: ./
         with:
           json-file: renovate.json
-      - name: Validate oxfmt config
-        uses: ./
-        with:
-          json-file: .oxfmtrc.json
 
   test:
     name: Test

src/validation.test.ts

@@ -58,10 +58,10 @@ describe("validateJson()", () => {
       {
         ok: true,
         text: async () =>
-          JSON.stringify({
+          ({
             despiteThisBeingValidJson:
               "toString() breaks it, making it invalid",
-          }),
+          }).toString(),
       },
     );
 
@@ -69,7 +69,7 @@ describe("validateJson()", () => {
       $schema: "https://json-schema.org/draft-07/schema",
     });
     await expect(validateJson(jsonFile)).rejects.toThrow(
-      'strict mode: unknown keyword: "despiteThisBeingValidJson"',
+      '"[object Object]" is not valid JSON',
     );
   });