tests: Add rpmbuild tests

Created a virtual testcase for building any rpm with rust.
Added two specific cases: rpm-sequoia and ripgrep

tests/Sanity/rpm-rebuild/main.fmf

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+summary: rpmbuild package with rust
+description: 'Ensure that rust does not break rpmbuild'
+contact:
+  - Jesus Checa Hidalgo <jcheca@redhat.com>
+component:
+  - rust
+test: ./runtest.sh
+framework: beakerlib
+require+:
+  - rust
+  - rpm-build
+  - yum-utils
+duration: 1h

tests/Sanity/rpm-rebuild/ripgrep.fmf

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+summary+: ": ripgrep"
+require+:
+  - ripgrep
+environment+:
+  PKG_TO_BUILD: "ripgrep"
+duration: 15m
+
+adjust+:
+  # ripgrep is not part of RHEL
+  - when: distro != fedora
+    enabled: false

tests/Sanity/rpm-rebuild/rpm-sequoia.fmf

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+summary+: ": rpm-sequoia"
+require+:
+  - rpm-sequoia
+environment+:
+  PKG_TO_BUILD: "rpm-sequoia"
+duration: 20m
+
+adjust+:
+  - when: distro < rhel-10, centos-stream-10
+    enabled: false
+    because: "rpm-sequoia is available only in RHEL >= 10"

tests/Sanity/rpm-rebuild/runtest.sh

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+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+PACKAGE="$(rpm -qf $(which rustc))"
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlAssertRpm $PACKAGE || rlDie "rustc not found. Aborting testcase..."
+        rlRun "TmpDir=\$(mktemp -d)" 0 "Creating tmp directory"
+        rlRun "pushd $TmpDir"
+
+        if [[ "x" == "x${PKG_TO_BUILD}" ]]; then
+            rlLogError "No package was configured to build."
+            rlDie "The package must be passed over PKG_TO_BUILD environment variable."
+        fi
+
+    rlPhaseEnd
+
+    rlPhaseStart FAIL ${PKG_TO_BUILD}FetchSrcAndInstallBuildDeps
+        if ! rlCheckRpm $PKG_TO_BUILD; then
+            rlRun "yum install -y $PKG_TO_BUILD ${YUM_SWITCHES}"
+            rlAssertRpm $PKG_TO_BUILD
+        fi
+        rlFetchSrcForInstalled $PKG_TO_BUILD
+        rlRun SRPM=$(ls -1 *.src.rpm)
+        rlRun "rpm -ivh $SRPM"
+        rlRun SPECDIR="$(rpm -E '%{_specdir}')"
+        # Note about the spec file name: When packaging rust crates, the package
+        # is named rust-<crate>, as well as the spec file, but the rpm package
+        # (the one we use in dnf to install and query) is named as the crate,
+        # (without the "rust-" prefix). We have to take that into account to
+        # find the spec:
+        # https://docs.fedoraproject.org/en-US/packaging-guidelines/Rust/#_package_naming
+        rlRun "SPECNAME=$(rpm -ql $SRPM | grep .spec)"
+
+        # Packages built with rust usually contains dynamic dependencies.
+        # builddep needs to be run from the srpm, not the spec file, to be able
+        # to generate them:
+        # https://fedoraproject.org/wiki/Changes/DynamicBuildRequires#rpmbuild
+        rlRun "yum-builddep -y ${SRPM} ${YUM_SWITCHES}"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        set -o pipefail
+        rlRun "rpmbuild -bb ${SPECDIR}/${SPECNAME} |& tee ${SRPM}_rpmbuild.log"
+        rlFileSubmit "${SRPM}_rpmbuild.log"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "popd"
+        rlRun "rm -r $TmpDir" 0 "Removing tmp directory"
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd