Add packit test plans

Signed-off-by: Nikola Forró <nforro@redhat.com>

.fmf/version

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+1

plans/full.fmf

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+summary: Unit, integration & functional tests.
+
+discover+:
+  filter: tag:full
+
+adjust:
+  - when: "initiator == packit"
+    because: "have the latest builds of ogr and specfile available for upstream test jobs"
+    prepare+:
+      # enable packit-dev Copr repo to get the latest builds of ogr and specfile
+      - how: install
+        copr: packit/packit-dev
+      # make sure the Copr repo has higher priority than TF Tag Repository
+      - how: shell
+        script: sed -i -n '/^priority=/!p;$apriority=5' /etc/yum.repos.d/*:packit:packit-dev.repo
+
+      # upgrade or install ‹ogr›, if needed
+      - how: shell
+        script: dnf -y upgrade python3-ogr || dnf -y install python3-ogr
+
+      # upgrade or install ‹specfile›, if needed
+      - how: shell
+        script: dnf -y upgrade python3-specfile || dnf -y install python3-specfile
+
+  - when: "distro == rhel-9 or distro == centos-9 or distro == centos-stream-9"
+    because: "build and deepdiff are not in EPEL 9"
+    prepare+:
+      - how: install
+        package: python3-pip
+      - how: shell
+        script: pip3 install build deepdiff
+
+  - when: "distro == rhel-10 or distro == centos-10 or distro == centos-stream-10"
+    because: "We are missing dependencies in EL10 that prohibit us from building."
+    enabled: false

plans/main.fmf

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+discover:
+    how: fmf
+    url: https://github.com/packit/packit.git
+    ref: main
+execute:
+    how: tmt