CI: Add packit to run end-to-end tests

.fmf/version

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+1

.packit.yaml

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+jobs:
+- job: tests
+  trigger: pull_request
+  metadata:
+    targets:
+    - fedora-stable
+    - fedora-rawhide
+    - centos-stream-9-x86_64
+    skip_build: true

packit-ci.fmf

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+/e2e:
+
+  summary: run keylime e2e tests
+
+  prepare:
+    how: shell
+    script:
+     - rm -f /etc/yum.repos.d/tag-repository.repo
+     - ln -s $(pwd) /var/tmp/rust-keylime_sources
+
+  discover:
+    how: fmf
+    url: https://github.com/RedHat-SP-Security/keylime-tests
+    ref: main
+    test:
+       - /setup/configure_tpm_emulator
+       - /setup/install_upstream_keylime
+       - /setup/install_upstream_rust_keylime
+       - /functional/basic-attestation-on-localhost
+       - /functional/basic-attestation-without-mtls
+       - /functional/basic-attestation-with-unpriviledged-agent
+       - /functional/keylime_tenant-commands-on-localhost
+
+  adjust:
+   # prepare step adjustments
+   - prepare+:
+       script+:
+        - yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
+     when: distro == centos-stream-9
+
+  execute:
+    how: tmt