github: remove xenial build

.github/workflows/builds.yml

@@ -1229,58 +1229,6 @@ jobs:
       - run: AFL_HARDEN=1 ac_cv_func_realloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes CFLAGS="-fsanitize=address -fno-omit-frame-pointer" CXXFLAGS=$CFLAGS CC=afl-clang-fast CXX=afl-clang-fast++ LDFLAGS="-fsanitize=address" ./configure --enable-fuzztargets --disable-shared
       - run: AFL_HARDEN=1 make -j2
 
-  # An Ubuntu 16.04 build using the tarball generated in the CentOS 8
-  # build above.
-  ubuntu-16-04:
-    name: Ubuntu 16.04
-    runs-on: ubuntu-latest
-    container: ubuntu:16.04
-    needs: alma-8
-    steps:
-      - name: Install dependencies
-        run: |
-          apt update
-          apt -y install \
-                build-essential \
-                curl \
-                libcap-ng-dev \
-                libcap-ng0 \
-                libevent-dev \
-                libhiredis-dev \
-                libjansson-dev \
-                libmagic-dev \
-                libnet1-dev \
-                libnetfilter-queue-dev \
-                libnetfilter-queue1 \
-                libnfnetlink-dev \
-                libnfnetlink0 \
-                libpcre2-dev \
-                libpcap-dev \
-                libyaml-0-2 \
-                libyaml-dev \
-                make \
-                python3-yaml \
-                zlib1g \
-                zlib1g-dev
-      - name: Install Rust
-        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain ${RUST_VERSION_MIN} -y
-      - run: echo "$HOME/.cargo/bin" >> $GITHUB_PATH
-      - name: Download suricata.tar.gz
-        uses: actions/download-artifact@f023be2c48cc18debc3bacd34cb396e0295e2869
-        with:
-          name: dist
-      - name: Extract
-        run: tar zxvf suricata-*.tar.gz --strip-components=1
-      - name: Configure
-        run: CFLAGS="${DEFAULT_CFLAGS}" ./configure
-      - name: Build
-        run: make -j2
-      - name: Testing
-        run: make check
-      - run: make install
-      - run: make install-conf
-      - run: make install-rules
-
   debian-10:
     name: Debian 10
     runs-on: ubuntu-latest