gitlab: add krb5 packages for gssapi tests and a second build

.gitlab-ci.yml

 stages:
   - build
 
-build:
+build1:
   stage: build
   script:
     - apt update
-    - apt install -y build-essential pkg-config automake libsasl2-dev heimdal-multidev libssl-dev libltdl-dev groff-base unixodbc-dev libwiredtiger-dev libperl-dev
+    - DEBIAN_FRONTEND=noninteractive apt install -y build-essential pkg-config automake libsasl2-dev heimdal-multidev libssl-dev libltdl-dev groff-base unixodbc-dev libwiredtiger-dev libperl-dev heimdal-kdc libsasl2-modules-gssapi-heimdal sasl2-bin
     - autoreconf
     - ./configure --enable-backends=mod --enable-overlays=mod --enable-modules --enable-dynamic --disable-ndb --disable-asyncmeta
     - make depend
@@ -18,3 +18,21 @@ build:
     expire_in: '1 week'
     paths:
       - tests/testrun/
+
+build2:
+  stage: build
+  script:
+    - apt update
+    - DEBIAN_FRONTEND=noninteractive apt install -y build-essential pkg-config automake libsasl2-dev libltdl-dev groff-base unixodbc-dev libwiredtiger-dev libperl-dev krb5-user krb5-kdc krb5-admin-server libsasl2-modules-gssapi-mit sasl2-bin libgnutls28-dev
+    - autoreconf
+    - ./configure --enable-backends=mod --enable-overlays=mod --disable-autoca --enable-modules --enable-dynamic --disable-ndb --disable-asyncmeta
+    - make depend
+    - make
+    - ulimit -n 4096 # back-monitor takes a while scanning a long connections array
+    - make test
+  artifacts:
+    name: testdir
+    when: on_failure
+    expire_in: '1 week'
+    paths:
+      - tests/testrun/