Handle multiple pull requests with same revision

Due to rebasing the same revision that triggered the pipeline for one
pull request can occur in other pull requests. With this not only the
first result from `gh search prs` is used, changes from all of them are
considered.

This means that some Tasks that might not need to run are still ran,
this should be acceptable given it guarantees that all Tasks that need
to run have ran.

.tekton/tasks/task-switchboard.yaml

@@ -46,15 +46,18 @@ spec:
 
         ec opa check --v1-compatible "${rules}"
 
-        pr_number="$(gh search prs --repo konflux-ci/build-definitions "$(params.revision)" --json number --jq '.[].number')"
+        rev="$(params.revision)"
+        changed_files=()
+        for pr_number in $(gh search prs --repo konflux-ci/build-definitions "${rev}" --json number --jq '.[].number'); do
+            echo "Found revision ${rev} in pull request number ${pr_number}"
 
-        echo "Determined pull request number ${pr_number}"
-
-        changed="$(gh pr view "https://github.com/konflux-ci/build-definitions/pull/${pr_number}" --json files --jq '[.files.[].path'])"
-        echo Changed files:
-        echo "${changed}" | jq -r '.[]'
+            changed="$(gh pr view "https://github.com/konflux-ci/build-definitions/pull/${pr_number}" --json files --jq '[.files.[].path'])"
+            echo Changed files:
+            echo "${changed}" | jq -r '.[]'
+            changed_files+=("${changed}")
+        done
 
-        echo "${changed}" | ec opa eval --v1-compatible --data "${rules}" --stdin-input \
+        echo "${changed_files[@]}" | jq -s 'add | unique' | ec opa eval --v1-compatible --data "${rules}" --stdin-input \
         'data[_]' \
         | jq '[.result.[].expressions.[].value | to_entries | .[] | select(.value == true) | .key]' \
         | tee "$(results.bindings.path)"