CI: Add basic chroot test

Didn't name it chroot as to not shadow the chroot command.

.ci/integration.sh

@@ -112,6 +112,10 @@ bump_autobuild() {
 	fi
 }
 
+chroot_basic() {
+	pmbootstrap chroot true
+}
+
 # Run the test
 echo "Running $test $*"
 "$test" "$@"

.ci/integration_tests/chroot_basic

@@ -0,0 +1 @@
+../integration.sh

.gitlab-ci.yml

@@ -282,3 +282,8 @@ pkgrel_bump amd64:
   extends: .integration
   script:
     - .ci/integration_tests/bump_autobuild qemu-amd64 hello-world
+
+chroot basic:
+  extends: .integration
+  script:
+    - .ci/integration_tests/chroot_basic