Put COMPOSE_WEB_VERSION to the gradle properties and do not invoke System.getEnv directly

Using getEnv at this phase leads to a configuration error. It's most
likely a bug in gradle.

web/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
     id("org.jetbrains.kotlin.multiplatform") version("1.4.32") apply(false)
 }
 
+val COMPOSE_WEB_VERSION: String by project
 
 subprojects { 
     apply(plugin = "maven-publish")
@@ -13,7 +14,7 @@ subprojects {
             publications {
                 create<MavenPublication>("maven") {
                     groupId = "org.jetbrains.compose.web"
-                    version = System.getenv("COMPOSE_WEB_VERSION")
+                    version = COMPOSE_WEB_VERSION
                 }
             }
 

web/gradle.properties

@@ -1 +1,2 @@
 COMPOSE_CORE_VERSION = 0.0.8-SNAPSHOT
+COMPOSE_WEB_VERSION = 0.0.8-SNAPSHOT