github-ci: remove fedora 31 (eol)

.github/workflows/builds.yml

@@ -406,82 +406,6 @@ jobs:
             exit 0
           fi
 
-  fedora-31:
-    name: Fedora 31
-    runs-on: ubuntu-latest
-    container: fedora:31
-    needs: prep
-    steps:
-
-      # Cache Rust stuff.
-      - name: Cache cargo registry
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/registry
-          key: cargo-registry
-
-      - run: |
-          dnf -y install \
-                autoconf \
-                automake \
-                cargo \
-                ccache \
-                diffutils \
-                file-devel \
-                gcc \
-                gcc-c++ \
-                git \
-                jansson-devel \
-                jq \
-                lua-devel \
-                libtool \
-                libyaml-devel \
-                libnfnetlink-devel \
-                libnetfilter_queue-devel \
-                libnet-devel \
-                libcap-ng-devel \
-                libevent-devel \
-                libmaxminddb-devel \
-                libpcap-devel \
-                libtool \
-                lz4-devel \
-                make \
-                nspr-devel \
-                nss-devel \
-                nss-softokn-devel \
-                pcre-devel \
-                pkgconfig \
-                python3-yaml \
-                sudo \
-                which \
-                zlib-devel
-      - name: Installing packages to build documentation
-        run: |
-          dnf -y install \
-                python3-sphinx \
-                texlive-scheme-full
-      - name: Install cbindgen
-        run: cargo install --force --debug --version 0.14.1 cbindgen
-      - run: echo "$HOME/.cargo/bin" >> $GITHUB_PATH
-      - uses: actions/checkout@v2
-      - uses: actions/download-artifact@v2
-        with:
-          name: prep
-          path: prep
-      - run: tar xf prep/libhtp.tar.gz
-      - run: ./autogen.sh
-      - run: CFLAGS="${DEFAULT_CFLAGS}" ./configure --enable-unittests
-      - run: make -j2
-      - run: make check
-      - run: make dist
-      - run: test -e doc/devguide/devguide.pdf
-      - run: test -e doc/userguide/userguide.pdf
-      - run: make distcheck
-      - name: Extracting suricata-verify
-        run: tar xf prep/suricata-verify.tar.gz
-      - name: Running suricata-verify
-        run: python3 ./suricata-verify/run.py
-
   ubuntu-20-04:
     name: Ubuntu 20.04 (no nss, no nspr)
     runs-on: ubuntu-latest