ci: add Gitea Actions workflow for make check (#21)

Adds CI workflow that runs `make check` on push/PR to main.

Co-authored-by: user <user@Mac.lan guest wan>
Co-authored-by: clawbot <clawbot@eeqj.de>
Reviewed-on: #21
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>
Co-committed-by: clawbot <sneak+clawbot@sneak.cloud>

internal/macse/secure_enclave.h

@@ -1,3 +1,5 @@
+//go:build darwin
+
 #ifndef SECURE_ENCLAVE_H
 #define SECURE_ENCLAVE_H
 

internal/macse/secure_enclave.m

@@ -1,3 +1,5 @@
+//go:build darwin
+
 #import <Foundation/Foundation.h>
 #import <Security/Security.h>
 #include "secure_enclave.h"