Adding a very basic CI test that just installs the shell.

ASGS can take a long time to build everything, so this is a very short
test that makes sure that the shell can be installed via:

  ./init-asgs.sh -b -x "--update-shell"

This will generate ./asgsh and ./update-asgs.

.github/workflows/01-basic.yaml

@@ -0,0 +1,22 @@
+name: Run Bash Script on ci-test Branch
+
+on:
+  push:
+    branches:
+      - ci-test
+  pull_request:
+    branches:
+      - ci-test
+
+jobs:
+  run-bash-script:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Run install script
+        run: |
+          chmod +x ./ci/01-install-shell-only.sh
+          ./ci/01-install-shell-only.sh

ci/01-install-shell-only.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+./init-asgs.sh -b -x "--update-shell"
+
+if [ ! -e ./asgsh ]; then
+  echo "01 not ok - can't find ./asgsh" >&2
+  exit 1
+fi
+
+echo "01 ok - found ./asgsh"
+
+if [ ! -e ./update-asgs ]; then
+  echo "02 not ok - can't find ./update-asgs" >&2
+  exit 1
+fi
+
+echo "02 ok - found ./update-asgs"