Add app delivery github action (#4232)

Author: Withalion

.github/workflows/app_delivery.yml

@@ -0,0 +1,88 @@
+name: Mergin Maps delivery
+on:
+  workflow_run:
+    types:
+      - "completed"
+    workflows:
+      - "macOS Build"
+      - "linux Build"
+      - "win64 Build"
+      - "Android Build"
+      - "iOS Build"
+
+permissions:
+  actions: read
+  pull-requests: write
+
+jobs:
+  comment_on_pr:
+    if: github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Find Artifacts and Format Comment
+        id: artifact_finder
+        uses: actions/github-script@v7
+        with:
+          # This script finds the artifacts from the required dependency workflows
+          # that ran on the same commit (head_sha) as this PR.
+          script: |
+            const buildWorkflowNames = ['macOS Build', 'linux Build', 'win64 Build', 'Android Build', 'iOS Build'];
+            const headSha = context.payload.pull_request.head.sha;
+            let commentBody = '## 📦 Build Artifacts Ready\n\n';
+            let artifactsFound = false;
+            
+            for (const workflowName of buildWorkflowNames) {
+              // 1. Find the latest successful run for the specific workflow and commit SHA
+              const runsResponse = await github.rest.actions.listWorkflowRunsForRepo({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                head_sha: headSha,
+                status: 'success',
+                per_page: 10
+              });
+            
+              // Filter to find the run matching the exact workflow name
+              const latestRun = runsResponse.data.workflow_runs.find(run => 
+                run.name === workflowName && run.conclusion === 'success'
+              );
+            
+              if (!latestRun) {
+                console.log(`Could not find a successful run for workflow: ${workflowName}`);
+                commentBody += `- :x: **${workflowName}**: Build not yet complete or failed.\n`;
+                continue;
+              }
+            
+              // 2. List artifacts for that specific run
+              const artifactsResponse = await github.rest.actions.listWorkflowRunArtifacts({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                run_id: latestRun.id,
+              });
+            
+              const artifacts = artifactsResponse.data.artifacts;
+            
+              if (artifacts.length > 0) {
+                commentBody += `### ${workflowName} (Run #${latestRun.id})\n`;
+            
+                for (const artifact of artifacts) {
+                  const apiDownloadUrl = `https://api.github.com/repos/${context.repo.owner}/${context.repo.repo}/actions/artifacts/${artifact.id}/zip`;
+            
+                  commentBody += `- [📥 **${artifact.name}**](${apiDownloadUrl}) (Expires: ${new Date(artifact.expires_at).toLocaleDateString()})\n`;
+                  artifactsFound = true;
+                }
+              }
+            }
+            
+            if (artifactsFound) {
+                // Set the output for the next step
+                core.setOutput('comment_body', commentBody);
+            } else {
+                core.setOutput('comment_body', 'No artifacts found for this PR commit.');
+            }
+
+      - name: Update Comment
+        if: steps.artifact_finder.outputs.comment_body != 'No artifacts found for this PR commit.'
+        uses: peter-evans/create-or-update-comment@v5
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: ${{ steps.artifact_finder.outputs.comment_body }}