use absolute path for BUILDEVENTS_FILE

README.md

@@ -51,6 +51,7 @@ Name         | Required | Description                                          |
 
 Additionally, the following environment variable will be read:
 
+
 `BUILDEVENT_FILE`: the path to a file containing additional key-value pairs. Data in this file will be attached to every span sent by buildevents. If this environment variable is not set, `gha-buildevents` will set this to a location outside the working directory.  
 When setting this environment variable, is recommended to set this [at the beginning of the workflow](https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#env).
 

dist/index.js

@@ -5447,7 +5447,7 @@ function addFields(keyValueMap) {
     const BUILDEVENT_FILE = 'BUILDEVENT_FILE';
     let envPath = util.getEnv(BUILDEVENT_FILE);
     if (!envPath) {
-        envPath = '../buildevents.txt';
+        envPath = path.resolve('../buildevents.txt');
         util.setEnv(BUILDEVENT_FILE, envPath);
     }
     // Add the existing values from the BUILDEVENT_FILE to the fields we write out

src/buildevents.ts

@@ -33,7 +33,7 @@ export function addFields(keyValueMap: object): void {
 
   let envPath = util.getEnv(BUILDEVENT_FILE)
   if (!envPath) {
-    envPath = '../buildevents.txt'
+    envPath = path.resolve('../buildevents.txt')
     util.setEnv(BUILDEVENT_FILE, envPath)
   }
   // Add the existing values from the BUILDEVENT_FILE to the fields we write out