fix(abg): provide a checksum for maven metadata or consumers are unhappy

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/Md5Checksum.kt

@@ -0,0 +1,11 @@
+package io.github.typesafegithub.workflows.mavenbinding
+
+import java.security.MessageDigest
+
+internal fun ByteArray.md5Checksum(): String {
+    val md5 = MessageDigest.getInstance("MD5")
+    val hashBytes = md5.digest(this)
+    return hashBytes.joinToString("") { "%02x".format(it) }
+}
+
+internal fun String.md5Checksum(): String = this.toByteArray(charset = Charsets.UTF_8).md5Checksum()

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/PackageArtifactsBuilding.kt

@@ -6,5 +6,6 @@ suspend fun ActionCoords.buildPackageArtifacts(githubToken: String): Map<String,
     val mavenMetadata = buildMavenMetadataFile(owner = owner, name = name, githubToken = githubToken)
     return mapOf(
         "maven-metadata.xml" to mavenMetadata,
+        "maven-metadata.xml.md5" to mavenMetadata.md5Checksum(),
     )
 }

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/VersionArtifactsBuilding.kt

@@ -1,7 +1,6 @@
 package io.github.typesafegithub.workflows.mavenbinding
 
 import io.github.typesafegithub.workflows.actionbindinggenerator.domain.ActionCoords
-import java.security.MessageDigest
 
 sealed interface Artifact
 
@@ -28,11 +27,3 @@ fun ActionCoords.buildVersionArtifacts(): Map<String, Artifact>? {
         "$name-$version.module.md5" to TextArtifact(module.md5Checksum()),
     )
 }
-
-private fun ByteArray.md5Checksum(): String {
-    val md5 = MessageDigest.getInstance("MD5")
-    val hashBytes = md5.digest(this)
-    return hashBytes.joinToString("") { "%02x".format(it) }
-}
-
-private fun String.md5Checksum(): String = this.toByteArray(charset = Charsets.UTF_8).md5Checksum()