Add Ubuntu 22.04 back to ci (#197)

Author: mcbarton

.github/workflows/main.yml

@@ -30,6 +30,9 @@ jobs:
             coverage: true
             extra_cmake_flags: -DCMAKE_BUILD_TYPE=Debug
             micromamba_shell_init: bash
+          - name: ubu22
+            os: ubuntu-22.04
+            micromamba_shell_init: bash
           - name: osx13-x86
             os: macos-13
             micromamba_shell_init: bash
@@ -188,6 +191,10 @@ jobs:
             os: ubuntu-24.04
             emsdk_ver: "3.1.45"
             micromamba_shell_init: bash
+          - name: ubu22
+            os: ubuntu-22.04
+            emsdk_ver: "3.1.45"
+            micromamba_shell_init: bash
           - name: osx13-x86
             os: macos-13
             emsdk_ver: "3.1.45"