Add upstream CI for test PR's to main branch

Packit CI, can run test suite against incoming
code changes to repository. CI can catch mistakes
and failures in new code.

.fmf/version

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+1

.packit.yaml

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+---
+jobs:
+  - job: tests
+    trigger: pull_request
+    branch: main
+    targets:
+      - fedora-stable
+    skip_build: true
+    tf_extra_params:
+      environments:
+        - tmt:
+            context:
+              target_PR_branch: main

packit-ci.fmf

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+summary: CI for PR's to main branch
+
+
+prepare:
+  - how: shell
+    script:
+     - ln -s $(pwd) /var/tmp/tang-operator_sources || true
+     - systemctl disable --now dnf-makecache.service || true
+     - systemctl disable --now dnf-makecache.timer || true
+     - dnf makecache
+
+environment:
+  TANG_IMAGE: "quay.io/sec-eng-special/fedora_tang_server"
+  UPSTREAM_OPERATOR: "true"
+  REPO_CLONE: "tang"
+
+discover:
+  - name: Configure_test_system
+    how: fmf
+    url: https://github.com/RedHat-SP-Security/common-cloud-orchestration
+    ref: main
+    test:
+      - /Setup/setup_local_cluster
+  - name: Run_tests
+    how: fmf
+    url: https://github.com/RedHat-SP-Security/tang-operator-tests
+    ref: main
+    test:
+      - /Setup/install_upstream_tang-operator
+      - /Setup/creating_test_namespace
+      - /Sanity
+      - /Setup/clean_cluster
+
+execute:
+    how: tmt
+