ci: run on older ubuntu

.github/workflows/build.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     strategy:
       matrix:
@@ -60,11 +60,11 @@ jobs:
       - name: Install Open VPN
         run: |
           sudo apt install apt-transport-https
-          sudo mkdir -p /etc/apt/keyrings && curl -fsSL https://packages.openvpn.net/packages-repo.gpg | sudo tee /etc/apt/keyrings/openvpn.asc
-          DISTRO=$(lsb_release -c -s)
-          echo "deb [signed-by=/etc/apt/keyrings/openvpn.asc] https://packages.openvpn.net/openvpn3/debian $DISTRO main" | sudo tee /etc/apt/sources.list.d/openvpn-packages.list
+          sudo wget https://swupdate.openvpn.net/repos/openvpn-repo-pkg-key.pub
+          sudo apt-key add openvpn-repo-pkg-key.pub
+          sudo wget -O /etc/apt/sources.list.d/openvpn3.list https://swupdate.openvpn.net/community/openvpn3/repos/openvpn3-jammy.list
           sudo apt update
-          sudo apt install openvpn3
+          sudo apt install openvpn3=17~betaUb22042+jammy
 
       - name: Start Open VPN 3
         run: openvpn3 session-start --config .github/vpn/config.ovpn