Attempt CI fix

.drone.yml

@@ -8,7 +8,8 @@ environment:
 steps:
   - name: setup
     image: ubuntu:latest
-    
+    environment:
+      ZIG_VERSION: ${ZIG_VERSION}
     commands:
       - apt-get update
       - apt-get install -y xz-utils wget libsdl2-dev glslang-tools spirv-tools
@@ -19,12 +20,16 @@ steps:
 
   - name: build
     image: ubuntu:latest
+    environment:
+      ZIG_VERSION: ${ZIG_VERSION}
     commands:
       - export PATH=$PATH:$(pwd)/zig-linux-x86_64-${ZIG_VERSION}
       - zig build
 
   - name: test
     image: ubuntu:latest
+    environment:
+      ZIG_VERSION: ${ZIG_VERSION}
     commands:
       - export PATH=$PATH:$(pwd)/zig-linux-x86_64-${ZIG_VERSION}
       - zig build test