Use develocity build cache in PRs and local builds

Ported from open-telemetry/opentelemetry-java-instrumentation#15579

Author: trask

.gitignore

@@ -35,4 +35,6 @@ bin
 .swp
 
 # Polyglot runtime manager (asdf rust clone)
-.rtx.toml
+.rtx.toml
+
+build-scan.txt

settings.gradle.kts

@@ -18,36 +18,36 @@ val develocityServer = "https://develocity.opentelemetry.io"
 val isCI = System.getenv("CI") != null
 val develocityAccessKey = System.getenv("DEVELOCITY_ACCESS_KEY") ?: ""
 
-// if develocity access key is not given and we are in CI, then we publish to scans.gradle.com
-val useScansGradleCom = isCI && develocityAccessKey.isEmpty()
-
 develocity {
-    if (useScansGradleCom) {
-        buildScan {
-            termsOfUseUrl = "https://gradle.com/help/legal-terms-of-use"
-            termsOfUseAgree = "yes"
-        }
-    } else {
+    if (develocityAccessKey.isNotEmpty()) {
         server = develocityServer
-        buildScan {
-            publishing.onlyIf { it.isAuthenticated }
-        }
     }
 
     buildScan {
-        uploadInBackground = !isCI
+        if (develocityAccessKey.isNotEmpty()) {
+        } else if (isCI) {
+            termsOfUseUrl = "https://gradle.com/help/legal-terms-of-use"
+            termsOfUseAgree = "yes"
+        } else {
+            publishing.onlyIf { false }
+        }
 
         capture {
             fileFingerprints = true
         }
+
+        buildScanPublished {
+            File("build-scan.txt").printWriter().use { writer ->
+                writer.println(buildScanUri)
+            }
+        }
     }
 }
 
-if (!useScansGradleCom) {
-    buildCache {
-        remote(develocity.buildCache) {
-            isPush = isCI && develocityAccessKey.isNotEmpty()
-        }
+buildCache {
+    remote(HttpBuildCache::class) {
+        url = uri("$develocityServer/cache/")
+        isPush = isCI && develocityAccessKey.isNotEmpty()
     }
 }