Let's try sh-on-windows as well.

.drone.yml

@@ -1,4 +1,7 @@
+clone:
+    depth: 10
 build:
+    cygwin:
         image: teaci/cygwin32
         pull: true
         shell: cygwin32
@@ -7,4 +10,11 @@ build:
           - id
           - C:/cygwin-installer.exe --site http://mirrors.tea-ci.org/cygwin --local-package-dir Z:/tmp/cygwin -W -P ninja
           - make PREFIX=/tmp/acki +ack
+    linuxonwindows:
+        image: teaci/msys32
+        pull: true
+        shell: sh
+        commands:
+          - apt install build-essentials ninja
+          - make