feat: support workflow_dispatch (#12)

* feat: support workflow_dispatch

Signed-off-by: Rishav Dhar <19497993+rdhar@users.noreply.github.com>

* remove pull_request_target test

Signed-off-by: Rishav Dhar <19497993+rdhar@users.noreply.github.com>

* embed branch-based-query within fallback

Signed-off-by: Rishav Dhar <19497993+rdhar@users.noreply.github.com>

* docs include `workflow_dispatch`

Signed-off-by: Rishav Dhar <19497993+rdhar@users.noreply.github.com>

---------

Signed-off-by: Rishav Dhar <19497993+rdhar@users.noreply.github.com>

Author: rdhar

README.md

@@ -10,6 +10,7 @@ Supported event triggers:
 - `issue_comment`
 - `merge_group`
 - `push`
+- `workflow_dispatch`
 - `pull_request` (of course!)
 
 </br>

action.yml

@@ -1,7 +1,7 @@
 ---
 name: Get Current PR Data
 author: Rishav Dhar (@rdhar)
-description: Get current PR data from any event trigger, including: issue_comment, merge_group, and push.
+description: "Get current PR data from any event trigger, including: issue_comment, merge_group, push, and workflow_dispatch."
 
 runs:
   using: composite
@@ -16,6 +16,9 @@ runs:
     - id: data
       shell: bash
       run: |
+        # Fallback on empty string if the branch is not found.
+        branch=${{ github.ref_name || github.head_ref || github.ref || '' }}
+
         # Get PR number using GitHub API for different event triggers.
         if [[ "$GITHUB_EVENT_NAME" == "push" ]]; then
           # List PRs associated with the commit, then get the PR number from the head ref or the latest PR.
@@ -25,11 +28,10 @@ runs:
           # Get the PR number by parsing the ref name.
           number=$(echo "${GITHUB_REF_NAME}" | sed -n 's/.*pr-\([0-9]*\)-.*/\1/p')
         else
-          # Fallback on 0 if the PR number is not found.
-          number=${{ github.event.number || github.event.issue.number || 0 }}
+          # Get the PR number from branch name, otherwise fallback on 0 if the PR number is not found.
+          number=$(gh api /repos/{owner}/{repo}/pulls --header "$GH_API" --method GET --field per_page=100 --field head="${branch}" | jq .[0].number) || ${{ github.event.number || github.event.issue.number || 0 }}
         fi
-        # Fallback on empty string if the branch is not found.
-        branch=${{ github.ref_name || github.head_ref || github.ref || '' }}
+
         echo "branch=$branch" >> "$GITHUB_OUTPUT"
         echo "number=$number" >> "$GITHUB_OUTPUT"