fix: align runner.os / runner.arch to known values (#1510)

* fix: align runner.os / runner.arch to known values

* .

* .

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/run_context.go

@@ -179,10 +179,11 @@ func (rc *RunContext) startHostEnvironment() common.Executor {
 			StdOut: logWriter,
 		}
 		rc.cleanUpJobContainer = rc.JobContainer.Remove()
-		rc.Env["RUNNER_TOOL_CACHE"] = toolCache
-		rc.Env["RUNNER_OS"] = runtime.GOOS
-		rc.Env["RUNNER_ARCH"] = runtime.GOARCH
-		rc.Env["RUNNER_TEMP"] = runnerTmp
+		for k, v := range rc.JobContainer.GetRunnerContext(ctx) {
+			if v, ok := v.(string); ok {
+				rc.Env[fmt.Sprintf("RUNNER_%s", strings.ToUpper(k))] = v
+			}
+		}
 		for _, env := range os.Environ() {
 			i := strings.Index(env, "=")
 			if i > 0 {