Rework buildSrc and remove usage of subprojects

buildSrc/src/main/kotlin/mihon/buildlogic/Commands.kt

@@ -0,0 +1,35 @@
+package mihon.buildlogic
+
+import org.gradle.api.Project
+import java.io.ByteArrayOutputStream
+import java.time.LocalDateTime
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+
+// Git is needed in your system PATH for these commands to work.
+// If it's not installed, you can return a random value as a workaround
+fun Project.getCommitCount(): String {
+    return runCommand("git rev-list --count HEAD")
+    // return "1"
+}
+
+fun Project.getGitSha(): String {
+    return runCommand("git rev-parse --short HEAD")
+    // return "1"
+}
+
+private val BUILD_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss'Z'")
+
+@Suppress("UnusedReceiverParameter")
+fun Project.getBuildTime(): String {
+    return LocalDateTime.now(ZoneOffset.UTC).format(BUILD_TIME_FORMATTER)
+}
+
+private fun Project.runCommand(command: String): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = command.split(" ")
+        standardOutput = byteOut
+    }
+    return String(byteOut.toByteArray()).trim()
+}