Switches back to self-hosted Actions runners

.github/workflows/vagrant-up.yml

@@ -22,15 +22,16 @@ on:
 
 jobs:
   vagrant-provision:
-    # Running on macOS, because macOS-based GitHub-hosted action runners do support nested virtualization.
+    # Running on self-hosted system(s), because GitHub-hosted action runners did break too often.
     # https://github.com/actions/runner-images/issues/433
-    runs-on: macos-12
-
+    runs-on: [self-hosted]
     steps:
+    - name: clean up old VMs
+      run: | 
+        vboxmanage list vms | \
+        grep -o -P '(?<={).*(?=})' | \
+        while read line ; do vboxmanage unregistervm $line --delete ; done
     - uses: actions/checkout@v3
-    - name: install dependencies
-      run: |
-        brew install wget unzip gnu-tar gnu-sed
     - name: show Vagrant version
       run: vagrant --version
     - name: run vagrant up
@@ -45,9 +46,8 @@ jobs:
         vboxmanage export emoflon -o emoflon.ovf
         sed -i -e '/<BIOS>/,/<\/BIOS>/d' emoflon.ovf
         sed -i -e '/<RemoteDisplay enabled="true">/,/<\/RemoteDisplay>/d' emoflon.ovf
-        gtar -cvf emoflon.ova emoflon.ovf emoflon-disk001.vmdk
+        tar -cvf emoflon.ova emoflon.ovf emoflon-disk001.vmdk
         rm -rf emoflon.ovf emoflon-disk001.vmdk
-      # ^gtar (to use gnu-tar) instead of macOS tar
     - name: upload artifact
       uses: actions/upload-artifact@v3
       with:

README.md

@@ -37,6 +37,8 @@ Unfortunately, only the macOS-based GitHub-hosted action runners do support nest
 
 Therefore, we've adapted the CI-configuration to provision the **eMoflon-IBeX-VM** on a macOS-based runner until nested virtualization support gets added to the Linux-based runners.
 
+Unfortunately, these workflows did break **very often** lately so we switched back to self-hosted Linux-based runners.
+
 ### Self-hosted Linux-based runners
 
 Currently, all actions must be run by a self-hosted GitHub runner, because GitHub-hosted runners do not provide the VT-x flag:
@@ -62,4 +64,4 @@ Required packages (at least):
 - `VirtualBox`
 - `vagrant`
 
-**Please keep in mind that your runner (VM) needs the virtualization flag enabled and at least 6 GB of RAM!**
+**Please keep in mind that your runner (VM) needs the virtualization flag enabled and at least 10 GB of RAM!**