Never support Docker build features on Windows (#100218) (#100226)

Author: mark-vieira

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/docker/DockerSupportService.java

@@ -8,6 +8,7 @@
 package org.elasticsearch.gradle.internal.docker;
 
 import org.elasticsearch.gradle.Architecture;
+import org.elasticsearch.gradle.OS;
 import org.elasticsearch.gradle.Version;
 import org.elasticsearch.gradle.internal.info.BuildParams;
 import org.gradle.api.GradleException;
@@ -211,6 +212,11 @@ private boolean isExcludedOs() {
             return false;
         }
 
+        // Even if for some reason Docker exists on Windows agents, flag it as unsupported
+        if (OS.current() == OS.WINDOWS) {
+            return true;
+        }
+
         // Only some hosts in CI are configured with Docker. We attempt to work out the OS
         // and version, so that we know whether to expect to find Docker. We don't attempt
         // to probe for whether Docker is available, because that doesn't tell us whether