CI tests: Setup task for Fedora CI system

plans/ci/prepare/prepare.fmf

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+summary: Setup task
+prepare:
+    script: ./plans/ci/prepare/prepare.sh
+require:
+- koji
+- dnf-utils

plans/ci/prepare/prepare.sh

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+#!/bin/bash
+
+#
+# Setup task for Fedora CI system.  Install the x86_64 GCC build under test
+# along with its respective i686 (compat arch) bits needed for the testing.
+# KOJI_TASK_ID per https://github.com/fedora-ci/dist-git-pipeline/pull/50 .
+#
+
+set -x
+
+true "V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V-V"
+
+echo "KOJI_TASK_ID=$KOJI_TASK_ID"
+
+. /etc/os-release
+
+if [ "$ID" == "fedora" ] && [ "$(arch)" == "x86_64" ]; then
+
+    if [ -z "${KOJI_TASK_ID}" ]; then
+        echo "Missing koji task ID, skipping ..."
+        exit 0
+    fi
+
+    tmpd=`mktemp -d`
+    pushd $tmpd
+        koji download-task $KOJI_TASK_ID --noprogress --arch=src
+        ls
+        VR=$(rpm -qp gcc* --queryformat='%{version}-%{release}')
+    popd
+    rm -rf $tmpd
+
+    tmpd=`mktemp -d`
+    pushd $tmpd
+        koji download-task $KOJI_TASK_ID --noprogress --arch=x86_64 --arch=noarch
+        rm -f *debuginfo*
+        ls
+        dnf -y install *.rpm
+    popd
+    rm -rf $tmpd
+
+    tmpd=`mktemp -d`
+    pushd $tmpd
+        koji download-task $KOJI_TASK_ID --noprogress --arch=i686
+        rm -f *debuginfo*
+        ls
+        yum -y install libgcc-$VR* libgfortran-$VR* libgomp-$VR* libitm-$VR* \
+                       libstdc++-devel-$VR* libstdc++-$VR* libstdc++-static-$VR*
+    popd
+    rm -rf $tmpd
+else
+    echo "Not Fedora x86_64, skipping..."
+fi
+
+true "^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^"