Add an integration test or example on how to use the addOrUpdateRepoSecret function. #1607

func GithubAuth() (context.Context, *github.Client, error) {
	token := os.Getenv("API_GITHUB_TOKEN")
	if token == "" {
		return nil, nil, errors.New(`no API_GITHUB_TOKNE was found in the environment variables.
This is needed to authenticate with github. Please generate a github token that has access to do what you are trying to do
and export it as an environment variable.

ex:
	export API_GITHUB_TOKEN="<token contents string>"
`)
	}
	ctx := context.Background()
	ts := oauth2.StaticTokenSource(
		&oauth2.Token{AccessToken: token},
	)
	tc := oauth2.NewClient(ctx, ts)

	client := github.NewClient(tc)
	return ctx, client, nil
}

publicKey, _, err := client.Actions.GetRepoPublicKey(ctx, owner, repo)

func encryptSecretWithPublicKey(publicKey *github.PublicKey, secretName string, secretValue string) (*github.EncryptedSecret, error) {
	decodedPublicKey, err := base64.StdEncoding.DecodeString(publicKey.GetKey())
	if err != nil {
		return nil, errors.New(fmt.Sprintf("base64.StdEncoding.DecodeString was unable to decode public key: %v", err))
	}

	secretBytes := []byte(secretValue)
	encryptedBytes, exit := sodium.CryptoBoxSeal(secretBytes, decodedPublicKey)
	if exit != 0 {
		return nil, errors.New("sodium.CryptoBoxSeal exited with non zero exit code")
	}

	encryptedString := base64.StdEncoding.EncodeToString(encryptedBytes)
	keyID := publicKey.GetKeyID()
	encryptedSecret := &github.EncryptedSecret{
		Name:           secretName,
		KeyID:          keyID,
		EncryptedValue: encryptedString,
	}
	return encryptedSecret, nil
}

func AddRepoSecret(owner string, repo string, secretName string, secretValue string) (string, error) {
	ctx, client, err := GithubAuth()
	if err != nil {
		return "", err
	}
	publicKey, _, err := client.Actions.GetRepoPublicKey(ctx, owner, repo)
	if err != nil {
		return "", err
	}

	encryptedSecret, err := encryptSecretWithPublicKey(publicKey, secretName, secretValue)
	if err != nil {
		return "", err
	}

	_, err = client.Actions.CreateOrUpdateRepoSecret(ctx, owner, repo, encryptedSecret)
	if err != nil {
		return "", errors.New(fmt.Sprintf("Actions.CreateOrUpdateRepoSecret returned error: %v", err))
	}

	return secretName, nil
}