Initial workflow-stopper setup for Pezkuwi SDK CI/CD

.github/workflows/stopper.yml

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+name: Workflow Stopper
+
+on:
+  workflow_dispatch:
+    inputs:
+      github_sha:
+        description: 'The SHA of the commit to stop workflows for'
+        required: true
+      github_repository:
+        description: 'The repository (owner/repo) to stop workflows in'
+        required: true
+      github_ref_name:
+        description: 'The ref name (branch) to stop workflows for'
+        required: true
+      github_workflow_id:
+        description: 'The workflow run ID that triggered this'
+        required: true
+      github_job_name:
+        description: 'The job name that triggered this'
+        required: true
+
+jobs:
+  stop-workflows:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cancel running workflows
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.WORKFLOW_STOPPER_TOKEN }}
+          script: |
+            const [owner, repo] = '${{ github.event.inputs.github_repository }}'.split('/');
+            const sha = '${{ github.event.inputs.github_sha }}';
+            const triggerRunId = '${{ github.event.inputs.github_workflow_id }}';
+            const triggerJob = '${{ github.event.inputs.github_job_name }}';
+
+            console.log(`Stopping workflows for ${owner}/${repo} at SHA ${sha}`);
+            console.log(`Triggered by run ${triggerRunId}, job ${triggerJob}`);
+
+            // Get all running workflow runs for this SHA
+            const { data: runs } = await github.rest.actions.listWorkflowRunsForRepo({
+              owner,
+              repo,
+              status: 'in_progress',
+              head_sha: sha,
+              per_page: 100
+            });
+
+            console.log(`Found ${runs.workflow_runs.length} running workflows`);
+
+            // Cancel each running workflow (except the trigger)
+            for (const run of runs.workflow_runs) {
+              if (run.id.toString() === triggerRunId) {
+                console.log(`Skipping trigger workflow run ${run.id}`);
+                continue;
+              }
+
+              try {
+                await github.rest.actions.cancelWorkflowRun({
+                  owner,
+                  repo,
+                  run_id: run.id
+                });
+                console.log(`Cancelled workflow run ${run.id} (${run.name})`);
+              } catch (error) {
+                console.log(`Failed to cancel run ${run.id}: ${error.message}`);
+              }
+            }
+
+            // Also get queued workflows
+            const { data: queuedRuns } = await github.rest.actions.listWorkflowRunsForRepo({
+              owner,
+              repo,
+              status: 'queued',
+              head_sha: sha,
+              per_page: 100
+            });
+
+            console.log(`Found ${queuedRuns.workflow_runs.length} queued workflows`);
+
+            for (const run of queuedRuns.workflow_runs) {
+              try {
+                await github.rest.actions.cancelWorkflowRun({
+                  owner,
+                  repo,
+                  run_id: run.id
+                });
+                console.log(`Cancelled queued workflow run ${run.id} (${run.name})`);
+              } catch (error) {
+                console.log(`Failed to cancel queued run ${run.id}: ${error.message}`);
+              }
+            }
+
+            console.log('Workflow stopping complete');

README.md

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+# Pezkuwi Workflow Stopper
+
+Stops all running and queued workflows in a repository when a CI job fails. This saves compute resources by preventing unnecessary workflow runs from continuing after a failure is detected.
+
+## How It Works
+
+1. When a CI job fails in `pezkuwi-sdk`, the `workflow-stopper` action is triggered
+2. This action dispatches a workflow in this repository
+3. The workflow uses GitHub API to cancel all running/queued workflows for the same commit SHA
+
+## Setup
+
+### Required Secrets
+
+In this repository (`pezkuwichain/workflow-stopper`):
+- `WORKFLOW_STOPPER_TOKEN` - A GitHub PAT or App token with `actions:write` permission on `pezkuwichain/pezkuwi-sdk`
+
+In the target repository (`pezkuwichain/pezkuwi-sdk`):
+- `WORKFLOW_STOPPER_RUNNER_APP_ID` - GitHub App ID
+- `WORKFLOW_STOPPER_RUNNER_APP_KEY` - GitHub App private key
+
+### GitHub App Setup
+
+1. Create a GitHub App in your organization settings
+2. Grant it `actions:write` permission
+3. Install it on both `workflow-stopper` and `pezkuwi-sdk` repositories
+4. Add the App ID and private key as secrets
+
+## Usage
+
+This workflow is triggered via `workflow_dispatch` from the `pezkuwi-sdk` repository's CI pipelines.
+
+## License
+
+Apache-2.0 (same as Pezkuwi SDK)