Remove unnecessary function buildForArch()

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

.drone.jsonnet

@@ -6,9 +6,10 @@ local archs = [
   { target: 'x86_64-unknown-linux-musl', short: 'amd64-musl' },
 ];
 
-local getStepName(arch) = 'check ' + arch.short;
+local getStepName(arch) = 'build ' + arch.short;
 
-local buildForArch(arch) = {
+local add_build_steps() = [
+  {
     name: getStepName(arch),
     image: 'img.kie.rs/jjkiers/rust-dind-cross:1.62-slim',
     volumes: [
@@ -31,11 +32,8 @@ local buildForArch(arch) = {
       CROSS_REMOTE: true,
     },
     depends_on: ['wait-for-docker'],
-};
-
-local check_steps() = [
-  buildForArch(a)
-  for a in archs
+  }
+  for arch in archs
 ];
 
 {
@@ -60,7 +58,7 @@ local check_steps() = [
         path: '/var/run',
       }],
     }] +
-    check_steps() +
+    add_build_steps() +
     [
       {
         name: 'build',