Change on-push workflow to run unit tests

This changes workflows to run unit tests for every new commit (including
PRs). A new release will only be published if all tests pass on the
master branch.

.github/workflows/run-tests.yml

@@ -0,0 +1,50 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+name: Run tests
+
+on:
+  workflow_call:
+    inputs:
+      ref:
+        required: true
+        type: string
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v3
+        with:
+          repository: ${{ inputs.repository }}
+          ref: ${{ inputs.ref }}
+          submodules: recursive
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v2
+        with:
+          dotnet-version: |
+            3.1.x
+            6.0.x
+
+      - name: Initialize environment
+        run: |
+          mkdir -p ~/".local/share/Daedalic Entertainment GmbH/Barotrauma"
+
+      - name: Run tests
+        continue-on-error: true
+        run: dotnet test LinuxSolution.sln -clp:"ErrorsOnly;Summary" --logger "trx;LogFileName=$PWD/test-results.trx"
+
+      - name: Upload test results
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-results
+          path: test-results.trx
+
+      - name: Report test results
+        uses: dorny/test-reporter@v1
+        with:
+          name: Test results
+          path: test-results.trx
+          fail-on-error: true
+          reporter: dotnet-trx