Added package cleanup project

package-cleanup/action.yaml

@@ -0,0 +1,19 @@
+name: "package cleanup"
+description: "Cleans up old packages and versions"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install set-version tool
+      shell: bash
+      run: |
+        dotnet tool install \
+          --tool-path .tools \
+          ShEdraft.SetVersion \
+          --version 1.0.0 \
+          --add-source https://git.sh-edraft.de/api/packages/sh-edraft.de/nuget/index.json
+
+    - name: Run set-version
+      shell: bash
+      run: |
+        ./.tools/set-version --suffix dev