Add CI tests using gash

.github/workflows/ci.yml

@@ -233,8 +233,10 @@ jobs:
     # don't install them
       run: |
         zypper --non-interactive addrepo https://download.opensuse.org/repositories/home:cheusov/openSUSE_Tumbleweed/home:cheusov.repo
+        zypper --non-interactive addrepo https://download.opensuse.org/repositories/devel:languages:misc/openSUSE_Tumbleweed/devel:languages:misc.repo
         zypper --non-interactive --gpg-auto-import-keys refresh
         zypper --non-interactive --xmlout search --case-sensitive nbase- | xmlstarlet sel -t -v "/stream/search-result/solvable-list/solvable[not(contains(@name,'debuginfo') or contains(@name,'-tail') or contains(@name,'-ls'))]/@name" -nl | xargs zypper --non-interactive in --no-recommends -y
+        zypper --non-interactive in --no-recommends -y gash
     - name: 'Install extras'
     # A few file types need packages unavailable in OpenSuSE, so install some
     # binaries from elsewhere.
@@ -257,6 +259,8 @@ jobs:
       run: make check -k
     - name: 'Run tests with hush'
       run: make check -k SHELL='busybox hush'
+    - name: 'Run tests with gash'
+      run: make check -k SHELL=gash
     - name: 'Run tests using nbase'
       run: PATH="/usr/libexec/nbase/bin:$PATH" make check -k
     - name: 'Test installation'