Allow matching SHA to be canceled (#50)

Hi,

I've started using your action and it is really useful!

However, their was one use case for me that was not working:

- I have a workflow which temporally build and deploy a version of my app on every `pull_request`.
- I have a second workflow which cleanup the temporary deployment on `pull_request: types: [closed]`.
  - That second workflow call your action to cancel any build runs still running after the PR is closed.

The problem is that it will not cancel the latest build run if I merge that commit directly; since they both have the same SHA.

So I've added an option `allow_matching_sha` (default to `false`) which can disable that check and allow runs with the same sha on other workflows to be cancelled.

So my second workflow looks like this:
```yaml
on:
  pull_request:
    types: [closed]

jobs:
  cleanup-after-pr-closed:
    name: Cleanup After PR Closed
    runs-on: ubuntu-latest
    steps:
      - name: Cancel build runs
        uses: ericmatte/cancel-workflow-action@match-sha
        with:
          allow_matching_sha: true
          workflow_id: '######'
```

Cheers

Co-authored-by: Steven <[email protected]>

Author: ericmatte

Diff for: action.yml

@@ -8,6 +8,10 @@ inputs:
   workflow_id:
     description: 'Optional - A single Workflow ID or a comma separated list of IDs'
     required: false
+  ignore_sha:
+    description: 'Optional - Allow canceling other workflows with the same SHA. Useful for the `pull_request.closed` event.'
+    required: false
+    default: false
   access_token:
     description: 'Your GitHub Access Token, defaults to: {{ github.token }}'
     default: '${{ github.token }}'

Diff for: dist/index.js

@@ -5859,6 +5859,7 @@ async function main() {
     console.log({ eventName, sha, headSha, branch, owner, repo, GITHUB_RUN_ID });
     const token = core.getInput('access_token', { required: true });
     const workflow_id = core.getInput('workflow_id', { required: false });
+    const ignore_sha = core.getInput('ignore_sha', { required: false }) === 'true';
     console.log(`Found token: ${token ? 'yes' : 'no'}`);
     const workflow_ids = [];
     const octokit = github.getOctokit(token);
@@ -5885,7 +5886,9 @@ async function main() {
                 branch,
             });
             console.log(`Found ${data.total_count} runs total.`);
-            const runningWorkflows = data.workflow_runs.filter(run => run.head_branch === branch && run.head_sha !== headSha && run.status !== 'completed' &&
+            const runningWorkflows = data.workflow_runs.filter(run => run.head_branch === branch &&
+                (ignore_sha || run.head_sha !== headSha) &&
+                run.status !== 'completed' &&
                 new Date(run.created_at) < new Date(current_run.created_at));
             console.log(`Found ${runningWorkflows.length} runs in progress.`);
             for (const { id, head_sha, status } of runningWorkflows) {

Diff for: src/index.ts

@@ -23,6 +23,7 @@ async function main() {
   console.log({ eventName, sha, headSha, branch, owner, repo, GITHUB_RUN_ID });
   const token = core.getInput('access_token', { required: true });
   const workflow_id = core.getInput('workflow_id', { required: false });
+  const ignore_sha = core.getInput('ignore_sha', { required: false }) === 'true';
   console.log(`Found token: ${token ? 'yes' : 'no'}`);
   const workflow_ids: string[] = [];
   const octokit = github.getOctokit(token);
@@ -55,9 +56,11 @@ async function main() {
         branch,
       });
       console.log(`Found ${data.total_count} runs total.`);
-      const runningWorkflows = data.workflow_runs.filter(
-        run => run.head_branch === branch && run.head_sha !== headSha && run.status !== 'completed' &&
-            new Date(run.created_at) < new Date(current_run.created_at)
+      const runningWorkflows = data.workflow_runs.filter(run =>
+        run.head_branch === branch && 
+        (ignore_sha || run.head_sha !== headSha) &&
+        run.status !== 'completed' &&
+        new Date(run.created_at) < new Date(current_run.created_at)
       );
       console.log(`Found ${runningWorkflows.length} runs in progress.`);
       for (const {id, head_sha, status} of runningWorkflows) {