Download zig binary once

.woodpecker.yml

@@ -6,14 +6,24 @@ clone:
       lfs: false
 
 pipeline:
-  fmt:
+  prepare-compiler:
     image: alpine
+    commands:
+      - echo "Downloading dependencies..."
+      - apk add curl xz
+      - echo "Downloading zig binary..."
       - curl https://ziglang.org/download/0.10.0/zig-linux-x86_64-0.10.0.tar.xz | xz -d | tar -x
+
+  format:
+    image: alpine
+    commands:
+      - echo "Checking formatting..."
       - ./zig-linux-x86_64-0.10.0/zig fmt --check src/ tests/ build.zig
 
   unit-tests:
     image: alpine
     commands:
-      - apk add sqlite sqlite-dev libpq libpq-dev curl xz
-      - curl https://ziglang.org/download/0.10.0/zig-linux-x86_64-0.10.0.tar.xz | xz -d | tar -x
+      - echo "Downloading dependencies..."
+      - apk add sqlite sqlite-dev libpq libpq-dev
+      - echo "Running unit tests..."
       - ./zig-linux-x86_64-0.10.0/zig build unit