Move relay list generation into prepare

mullvad-vpn-daemon/APKBUILD

@@ -49,6 +49,12 @@ prepare() {
 	default_prepare
 
 	cargo fetch --target "$CHOST" --locked
+
+	# Generate vendored relay list
+	cargo run --frozen \
+		-p mullvad-api --bin relay_list \
+		--target "$CHOST" \
+		> "$builddir/relays.json"
 }
 
 build() {
@@ -63,12 +69,6 @@ build() {
 		-p mullvad-exclude \
 		-p mullvad-problem-report \
 		-p mullvad-setup
-
-	# Generate vendored relay list
-	cargo run --frozen \
-		-p mullvad-api --bin relay_list \
-		--target "$CHOST" \
-		> "$builddir/relays.json"
 }
 
 check() {