fix: repository determination without explicit checkout (#18)

* fix: repository determination without explicit checkout

* fix: dynamic determinal of commit SHA

Author: rdhar

action.yml

@@ -23,14 +23,14 @@ runs:
         # Get PR number using GitHub API for different event triggers.
         if [[ "$GITHUB_EVENT_NAME" == "push" ]]; then
           # List PRs associated with the commit, then get the PR number from the head ref or the latest PR.
-          associated_prs=$(gh api /repos/{owner}/{repo}/commits/${GITHUB_SHA}/pulls --header "$GH_API" --method GET --field per_page=100)
+          associated_prs=$(gh api /repos/${{ github.repository }}/commits/${{ github.event.pull_request.head.sha || github.sha }}/pulls --header "$GH_API" --method GET --field per_page=100)
           number=$(echo "$associated_prs" | jq --raw-output '(.[] | select(.head.ref == env.GITHUB_REF_NAME) | .number) // .[0].number // 0')
         elif [[ "$GITHUB_EVENT_NAME" == "merge_group" ]]; then
           # Get the PR number by parsing the ref name.
           number=$(echo "${GITHUB_REF_NAME}" | sed -n 's/.*pr-\([0-9]*\)-.*/\1/p')
         else
           # Get the PR number from branch name, otherwise fallback on 0 if the PR number is not found.
-          number=${{ github.event.number || github.event.issue.number }} || $(gh api /repos/{owner}/{repo}/pulls --header "$GH_API" --method GET --field per_page=100 --field head="${branch}" | jq '.[0].number // 0')
+          number=${{ github.event.number || github.event.issue.number }} || $(gh api /repos/${{ github.repository }}/pulls --header "$GH_API" --method GET --field per_page=100 --field head="${branch}" | jq '.[0].number // 0')
         fi
 
         echo "branch=$branch" >> "$GITHUB_OUTPUT"