Manually assemble build environment in CI script

.drone.yml

@@ -1,8 +1,16 @@
 kind: pipeline
-name: default
+name: Build and Test
 
 steps:
-- name: greetings
-  image: ziglang/static-base:llvm15-aarch64-2
+- name: Build and Test
+  image: alpine
   commands:
+  - apk update && apk add curl xz
+  - mkdir -p /deps
+  - pushd /deps
+  - curl https://ziglang.org/deps/zig+llvm+lld+clang-$(uname -m)-linux-musl-0.9.1.tar.xz -O
+  - tar xf zig+llvm+lld+clang-$(uname -m)-linux-musl-0.9.1.tar.xz
+  - mv zig+llvm+lld+clang-$(uname -m)-linux-musl-0.9.1/ local/
+  - popd
+  - RUN apk --no-cache add libc-dev
   - zig test src/main.zig