Pass credentials file explicitly

Author: tulir

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/rs/zerolog v1.33.0
 	go.mau.fi/util v0.8.3
 	go.mau.fi/zeroconfig v0.1.3
+	google.golang.org/api v0.170.0
 )
 
 require (
@@ -47,7 +48,6 @@ require (
 	golang.org/x/sys v0.28.0 // indirect
 	golang.org/x/text v0.21.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
-	google.golang.org/api v0.170.0 // indirect
 	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/appengine/v2 v2.0.2 // indirect
 	google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 // indirect

push.go

@@ -39,6 +39,7 @@ import (
 	"go.mau.fi/util/ptr"
 	"go.mau.fi/util/requestlog"
 	"go.mau.fi/zeroconfig"
+	"google.golang.org/api/option"
 )
 
 var fcmPackageName = os.Getenv("FCM_PACKAGE_NAME")
@@ -81,7 +82,7 @@ func main() {
 		),
 	}
 	ctx := log.WithContext(context.Background())
-	app := exerrors.Must(firebase.NewApp(ctx, nil))
+	app := exerrors.Must(firebase.NewApp(ctx, nil, option.WithCredentialsFile(os.Getenv("FCM_CREDENTIALS_FILE"))))
 	fcmClient = exerrors.Must(app.Messaging(ctx))
 	go func() {
 		c := make(chan os.Signal, 1)