WIP kotlin matrix workflow

.github/workflows/ci-kotlin-matrix.yml

@@ -0,0 +1,55 @@
+name: Kotlin Matrix CI
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * SAT"
+  push: # TODO: DROP
+    branches:
+      - kotlin-matrix-workflow
+
+jobs:
+  build:
+    name: K2=${{ matrix.k2 }} | ${{ matrix.kotlinVersion }} | ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ 'ubuntu-latest', 'macos-latest', 'windows-latest' ]
+        kotlinVersion: [
+          '1.8.21',
+          '[1.9.0-Beta,1.9.0-Beta-9999[',
+          '[1.9.20-dev,1.9.20-dev-9999['
+        ]
+        k2: [ 'true', 'false' ]
+    env:
+      KOTLIN_VERSION_OVERRIDE: ${{ matrix.kotlinVersion }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/setup-gradle
+        with:
+          cache-disabled: true
+
+      - name: Compile sources
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: build --scan --continue -Pkotlin.experimental.tryK2=${{ matrix.k2 }} -Pskip.test -Pskip.link
+
+      - name: Publish to Maven Local (compile intermediate source sets)
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: publishToMavenLocal -Pkotlin.experimental.tryK2=${{ matrix.k2 }} --scan --continue
+
+      - name: Build rsocket-core
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: rsocket-core:build --scan --continue -Pkotlin.experimental.tryK2=${{ matrix.k2 }}
+
+      - name: Link native binaries
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: build --scan --continue -Pkotlin.experimental.tryK2=${{ matrix.k2 }} -Pskip.test
+
+      - name: Build everything
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: build --scan --continue -Pkotlin.experimental.tryK2=${{ matrix.k2 }}