github: use default client and skip archive when uploading artifact

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/github/artifact.test.itg.ts

@@ -33,7 +33,6 @@ maybe('upload', () => {
     fs.copyFileSync(path.join(fixturesDir, `github-repo.json`), filename);
     const res = await GitHubArtifact.upload({
       filename: filename,
-      mimeType: 'application/json',
       retentionDays: 1
     });
     expect(res).toBeDefined();

__tests__/github/summary.test.itg.ts

@@ -85,7 +85,6 @@ maybe('writeBuildSummary', () => {
 
     const uploadRes = await GitHubArtifact.upload({
       filename: exportRes?.dockerbuildFilename,
-      mimeType: 'application/gzip',
       retentionDays: 1
     });
     expect(uploadRes).toBeDefined();
@@ -165,7 +164,6 @@ maybe('writeBuildSummary', () => {
 
     const uploadRes = await GitHubArtifact.upload({
       filename: exportRes?.dockerbuildFilename,
-      mimeType: 'application/gzip',
       retentionDays: 1
     });
     expect(uploadRes).toBeDefined();
@@ -220,7 +218,6 @@ maybe('writeBuildSummary', () => {
 
     const uploadRes = await GitHubArtifact.upload({
       filename: exportRes?.dockerbuildFilename,
-      mimeType: 'application/gzip',
       retentionDays: 1
     });
     expect(uploadRes).toBeDefined();