Merge build and test stages of new CI

.drone.yml

@@ -13,7 +13,7 @@ steps:
       - apt-get install -y git git-lfs
       - git submodule update --init --recursive
 
-  - name: build
+  - name: build & test
     image: ubuntu:latest
     commands:
       - apt-get update
@@ -22,9 +22,4 @@ steps:
       - tar -xf zig-linux-x86_64-$${ZIG_VERSION}.tar.xz
       - export PATH=$PATH:$(pwd)/zig-linux-x86_64-$${ZIG_VERSION}
       - zig build
-
-  - name: test
-    image: ubuntu:latest
-    commands:
-      - export PATH=$PATH:$(pwd)/zig-linux-x86_64-$${ZIG_VERSION}
-      - zig build test
+      - zig build test