unity setup action

.github/actions/setup-unity/action.yml

@@ -0,0 +1,29 @@
+name: Setup Unity
+description: Installs the Unity Editor
+
+inputs:
+  editor-version:
+    description: >
+      CKAN tag to install. set to an empty string to always install the most recent version. 
+      See https://github.com/KSP-CKAN/CKAN/tags for a list of available tags
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    - name: Install Unity public key
+      shell: bash
+      run: >-
+        wget -qO - https://hub.unity3d.com/linux/keys/public 
+        | gpg --dearmor 
+        | sudo tee /usr/share/keyrings/Unity_Technologies_ApS.gpg > /dev/null
+
+    - name: Install Unity apt package
+      shell: bash
+      run: >-
+        sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/Unity_Technologies_ApS.gpg] https://hub.unity3d.com/linux/repos/deb stable main" > /etc/apt/sources.list.d/unityhub.list'
+
+    - name: Install Unity hub
+      uses: tecolicom/actions-use-apt-tools@v1
+      with:
+        tools: 'unityhub'

.github/workflows/internal-ci.yml

@@ -25,6 +25,9 @@ jobs:
   test-plugin-legacy:
     uses: './.github/workflows/internal-test-plugin-legacy.yml'
 
+  test-assetbundle:
+    uses: './.github/workflows/internal-test-assetbundle.yml'
+
   build:
     env:
       DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
@@ -54,7 +57,7 @@ jobs:
 
   deploy-nuget:
     runs-on: ubuntu-latest
-    needs: [  test-plugin, test-plugin-nuget, test-plugin-legacy ]
+    needs: [  test-plugin, test-plugin-nuget, test-plugin-legacy, test-assetbundle ]
     environment:
       name: "NuGet"
       url: "https://www.nuget.org/packages/KSPBuildTools"

.github/workflows/internal-test-assetbundle.yml

@@ -0,0 +1,22 @@
+# This is an internal test for KSPBuildTools and not intended to be used by other projects
+name: Test Assetbundle
+
+on:
+  workflow_call:
+
+env:
+  TESTDIR: tests/plugin-mod
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/setup-ckan
+
+      - uses: ./.github/actions/compile
+        with:
+          ksp-zip-url: https://github.com/KSPModdingLibs/KSPLibs/raw/main/KSP-1.12.5.zip
+          working-directory: ${{ env.TESTDIR }}
+          solution-file-path: plugin-mod.csproj