fix CI build (rustup init)

packaging/alpine/local/greptimedb/APKBUILD

@@ -38,11 +38,15 @@ export LIBRARY_PATH="/usr/lib"
 
 prepare() {
 	default_prepare
-	rustup toolchain install --profile minimal --no-self-update "$_rust_toolchain"
+	rustup-init \
+		-y \
+		--no-modify-path \
+		--profile minimal \
+		--default-toolchain "$_rust_toolchain"
 }
 
 build() {
-	rustup run "$_rust_toolchain" cargo build \
+	"$CARGO_HOME"/bin/rustup run "$_rust_toolchain" cargo build \
 		--release \
 		--locked \
 		--bin greptime \