Register new external dependencies with the CI

.drone.yml

@@ -1,9 +1,27 @@
 kind: pipeline
+type: docker
 name: continuous integration
 
 steps:
-- name: build & test
-  image: chainguard/zig:latest
-  commands:
-  - zig build
-  - zig build test
+  - name: setup
+    image: ubuntu:latest
+    commands:
+      - apt-get update
+      - apt-get install -y wget gnupg software-properties-common
+      - apt-get install -y sdl2-dev glslang-tools spirv-tools
+      - wget https://ziglang.org/download/0.10.1/zig-linux-x86_64-0.10.1.tar.xz
+      - tar -xf zig-linux-x86_64-0.10.1.tar.xz
+      - export PATH=$PATH:$(pwd)/zig-linux-x86_64-0.10.1
+      - zig version
+
+  - name: build
+    image: ubuntu:latest
+    commands:
+      - export PATH=$PATH:$(pwd)/zig-linux-x86_64-0.10.1
+      - zig build
+
+  - name: test
+    image: ubuntu:latest
+    commands:
+      - export PATH=$PATH:$(pwd)/zig-linux-x86_64-0.10.1
+      - zig build test