fix: refactor publish command (#12)

## Description

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relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #12
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

cmd/cmd/publishCmd.go

@@ -255,16 +255,16 @@ func copyShaFiles(destPath, srcPath, repoName, version string) {
 
 	// Copy files from srcPath
 	shaSum := repoName + "_" + version + "_SHA256SUMS"
-	shaSumPath := srcPath + "/" + shaSum
+	shaSumPath := path.Join(srcPath, shaSum)
 
 	// _SHA256SUMS file
-	_, err := copyFile(shaSumPath, destPath+shaSum)
+	_, err := copyFile(shaSumPath, path.Join(destPath, shaSum))
 	if err != nil {
 		log.Println(err)
 	}
 
 	// _SHA256SUMS.sig file
-	_, err = copyFile(shaSumPath+".sig", destPath+shaSum+".sig")
+	_, err = copyFile(shaSumPath+".sig", path.Join(destPath, shaSum+".sig"))
 	if err != nil {
 		log.Println(err)
 	}
@@ -312,8 +312,8 @@ func copyBuildZips(destPath, distPath, repoName, version string) error {
 	// Loop through and copy each
 	for _, v := range shaSumContents {
 		zipName := v[1]
-		zipSrcPath := distPath + zipName
-		zipDestPath := destPath + zipName
+		zipSrcPath := path.Join(distPath, zipName)
+		zipDestPath := path.Join(destPath, zipName)
 
 		log.Printf("  - Zip Source: %s", zipSrcPath)
 		log.Printf("   - Zip Dest:  %s", zipDestPath)