fix: Skip commit message check if token not provided (#51)

* Skip commit message check if token not provided

* Add doc

README.md

@@ -25,7 +25,7 @@ BindPlane requires a license. You can request a free license [here](https://obse
 | enable_otel_config_write_back | `false`    | Whether or not the action should write the raw OpenTelemetry configurations back to the repository. | 
 | configuration_output_dir      |            | When write back is enabled, this is the path that will be written to. |
 | configuration_output_branch   |            | The branch to write the OTEL configuration resources to. If unset, target_branch will be used. |
-| token                         |            | The Github token that will be used to write to the repo. Usually secrets.GITHUB_TOKEN is sufficient. Requires the `contents.write` permission. Alternatively, you can set `github_url`, which should contain your access token. |
+| token                         |            | The Github token that will be used to read and write to the repo. Usually secrets.GITHUB_TOKEN is sufficient. Requires the `contents.write` permission. Alternatively, you can set `github_url`, which should contain your access token. |
 | enable_auto_rollout           | `false`    | When enabled, the action will trigger a rollout for any configuration that has been updated. |
 | tls_ca_cert                   |            | The contents of a TLS certificate authority, usually from a secret. See the [TLS](#tls) section. |
 | github_url                    |            | Optional URL to use when cloning the repository. Should be of the form `"https://{GITHUB_ACTOR}:{TOKEN}@{GITHUB_HOST}/{GITHUB_REPOSITORY}.git`. When set, `token` will not be used. |

cmd/action/main.go

@@ -125,22 +125,26 @@ func main() {
 		zap.Any("bindplane_version", version.Tag),
 	)
 
-	// Retrieve the commit message from the head commit on the branch
-	message, err := commitMessage(github_url, branch, token)
-	if err != nil {
-		logger.Error("error getting commit message", zap.Error(err))
-		os.Exit(exitClientError)
-	}
-
-	// If the commit message contains `progress rollout <name>`, progress the rollout
-	// for the configuration instead of running the full workflow.
-	if name, ok := extractConfigName(message); ok {
-		err := action.RunRollout(name)
+	if token != "" {
+		// Retrieve the commit message from the head commit on the branch
+		message, err := commitMessage(github_url, branch, token)
 		if err != nil {
-			logger.Error("error progressing rollout", zap.Error(err))
+			logger.Error("error getting commit message", zap.Error(err))
 			os.Exit(exitClientError)
 		}
-		return
+
+		// If the commit message contains `progress rollout <name>`, progress the rollout
+		// for the configuration instead of running the full workflow.
+		if name, ok := extractConfigName(message); ok {
+			err := action.RunRollout(name)
+			if err != nil {
+				logger.Error("error progressing rollout", zap.Error(err))
+				os.Exit(exitClientError)
+			}
+			return
+		}
+	} else {
+		logger.Info("Skipping commit message check, Github token not provided")
 	}
 
 	// Run the full workflow