Add release workflow (#60)

* Rename output dmg

```sh
./gradlew build

...

ls build/compose/binaries/main/dmg

kotlin-explorer-x64-1.4.3.dmg
```

* Build on macos-latest

* Upload dists

* Try macos-12

* Add release workflow

* Don't release in forks

* Tweak rename task

* Limit uploading step for tags only

.github/workflows/presubmit.yml

@@ -4,13 +4,20 @@ on:
   push:
     branches:
     - main
+    tags:
+      - '**'
   pull_request:
     branches:
     - main
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # macos-12 is for the x64 (intel) architecture
+        # https://github.com/actions/runner-images?tab=readme-ov-file#available-images
+        os: [ macos-12, macos-latest ]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4
@@ -19,3 +26,25 @@ jobs:
           java-version: 17
       - uses: gradle/actions/setup-gradle@v3
       - run: ./gradlew build
+      - uses: actions/upload-artifact@v4
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          name: distribution-${{ matrix.os }}
+          if-no-files-found: error
+          path: |
+            build/compose/binaries/main/dmg/kotlin-explorer-*.dmg
+
+  release:
+    runs-on: ubuntu-latest
+    if: github.repository_owner == 'romainguy' && startsWith(github.ref, 'refs/tags/')
+    needs: build
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+      - name: Create release and upload dists
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "${{ github.ref_name }}" **/*.dmg -t "${{ github.ref_name }}" --generate-notes

build.gradle.kts

@@ -1,6 +1,8 @@
 @file:Suppress("UnstableApiUsage")
 
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+import org.jetbrains.compose.desktop.application.tasks.AbstractJPackageTask
+import kotlin.io.path.listDirectoryEntries
 
 plugins {
     alias(libs.plugins.kotlin.multiplatform)
@@ -15,6 +17,9 @@ repositories {
     maven("https://packages.jetbrains.team/maven/p/kpm/public/")
 }
 
+version = "1.4.3"
+val baseName = "Kotlin Explorer"
+
 kotlin {
     jvm {
         @Suppress("OPT_IN_USAGE")
@@ -73,9 +78,9 @@ compose.desktop {
 
             targetFormats(TargetFormat.Dmg)
 
-            packageVersion = "1.4.3"
-            packageName = "Kotlin Explorer"
-            description = "Kotlin Explorer"
+            packageVersion = version.toString()
+            packageName = baseName
+            description = baseName
             vendor = "Romain Guy"
             licenseFile = rootProject.file("LICENSE")
 
@@ -87,3 +92,34 @@ compose.desktop {
         }
     }
 }
+
+val currentArch: String = when (val osArch = System.getProperty("os.arch")) {
+    "x86_64", "amd64" -> "x64"
+    "aarch64" -> "arm64"
+    else -> error("Unsupported OS arch: $osArch")
+}
+
+/**
+ * TODO: workaround for https://github.com/JetBrains/compose-multiplatform/issues/4976.
+ */
+val renameDmg by tasks.registering(Copy::class) {
+    group = "distribution"
+    description = "Rename the DMG file"
+
+    val packageDmg = tasks.named<AbstractJPackageTask>("packageDmg")
+    // build/compose/binaries/main/dmg/*.dmg
+    val fromFile = packageDmg.map {
+        it.appImage.get().dir("../dmg").asFile.toPath()
+            .listDirectoryEntries("$baseName*.dmg").single()
+    }
+
+    from(fromFile)
+    into(fromFile.map { it.parent })
+    rename {
+        "kotlin-explorer-$currentArch-$version.dmg"
+    }
+}
+
+tasks.assemble {
+    dependsOn(renameDmg)
+}