chore(ci): repoint push-email-notify to smtp-notify-action (#68)

Author: hyperpolymath

.github/workflows/actions.lock

@@ -3,13 +3,6 @@
 # Docs: https://gh.io/actions-lockfile
 version: 'v0.0.2'
 workflows:
-    '.github/workflows/governance.yml': []
-    '.github/workflows/hypatia-scan.yml': []
-    '.github/workflows/label-triage.yml': []
-    '.github/workflows/labels.yml': []
-    '.github/workflows/mirror.yml': []
-    '.github/workflows/scorecard.yml': []
-    '.github/workflows/secret-scanner.yml': []
     '.github/workflows/boj-build.yml':
         - 'actions/checkout@v4.1.7'
     '.github/workflows/casket-pages.yml':
@@ -19,14 +12,21 @@ workflows:
         - 'actions/deploy-pages@v4.0.5'
         - 'actions/upload-pages-artifact@v3.0.1'
         - 'haskell-actions/setup@v2.7.5'
+    '.github/workflows/governance.yml': []
+    '.github/workflows/hypatia-scan.yml': []
     '.github/workflows/instant-sync.yml':
         - 'peter-evans/repository-dispatch@v4.0.1'
+    '.github/workflows/label-triage.yml': []
+    '.github/workflows/labels.yml': []
+    '.github/workflows/mirror.yml': []
     '.github/workflows/pages.yml':
         - 'actions/checkout@v4.4.0'
         - 'actions/deploy-pages@v4.0.5'
         - 'actions/upload-pages-artifact@v3.0.1'
     '.github/workflows/push-email-notify.yml':
-        - 'dawidd6/action-send-mail@v3.12.0'
+        - 'hyperpolymath/smtp-notify-action@v0.2.0'
+    '.github/workflows/scorecard.yml': []
+    '.github/workflows/secret-scanner.yml': []
 dependencies:
     'actions/cache@v4.3.0':
         ref: 'v4.3.0'
@@ -70,16 +70,16 @@ dependencies:
         repo_id: 496012378
         uses:
             - 'actions/upload-artifact@v4'
-    'dawidd6/action-send-mail@v3.12.0':
-        ref: 'v3.12.0'
-        commit: 'sha1-6e502825a508b867ab2954ad6343b68787624c01'
-        owner_id: 9713907
-        repo_id: 222439721
     'haskell-actions/setup@v2.7.5':
         ref: 'v2.7.5'
         commit: 'sha1-ec49483bfc012387b227434aba94f59a6ecd0900'
         owner_id: 75048950
         repo_id: 623796603
+    'hyperpolymath/smtp-notify-action@v0.2.0':
+        ref: 'v0.2.0'
+        commit: 'sha1-ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7'
+        owner_id: 6759885
+        repo_id: 1352485172
     'peter-evans/repository-dispatch@v4.0.1':
         ref: 'v4.0.1'
         commit: 'sha1-28959ce8df70de7be546dd1250a005dd32156697'

.github/workflows/push-email-notify.yml

@@ -4,19 +4,43 @@
 # PUSH_EMAIL_ENABLED=true (the single on/off switch). Addresses are pre-filled;
 # sending needs the org SMTP secrets (SMTP_HOST/PORT/USER/PASS). Inherited by
 # new repos from the template; placed on existing repos by the farm sweep.
+#
+# Re-landed after the 2026-07-20 notification-storm freeze (removed in
+# 09f94c5), now on hyperpolymath/smtp-notify-action: Node-free, the SMTP
+# session is Idris2-specified and machine-checked, the binary is Zig-built,
+# byte-reproducible, and SHA-256-pinned inside the action itself.
 name: Push email notification
 on:
-  push: {}
+  push:
+    # Branch pushes only: tag and deletion payloads mislabel Branch:/head_commit.
+    branches: ['**']
+concurrency:
+  # Deliberately per-RUN, so no run is ever queued behind another and none is
+  # ever cancelled. Do NOT "tidy" this into a shared group such as
+  # ${{ github.workflow }}-${{ github.ref }}. GitHub's workflow-syntax docs:
+  # "By default, any existing pending job or workflow in the same concurrency
+  # group will be canceled and the new queued job or workflow will take its
+  # place." That happens regardless of cancel-in-progress, which governs only
+  # the RUNNING job. On this workflow it silently loses a notification email,
+  # with no error anywhere. Every run here reports a DISTINCT commit, so there
+  # is no redundant work for a concurrency limit to remove.
+  # The docs also offer `queue: max` (up to 100 pending); not used, because 100
+  # is still a cap whereas a per-run group needs none.
+  # Verified with zizmor 1.30.0: deleting this block raises concurrency-limits;
+  # this form silences it exactly as a shared group would.
+  group: push-email-${{ github.run_id }}
+  cancel-in-progress: false
 permissions:
   contents: read
 jobs:
   notify:
     name: Email on push
     if: ${{ vars.PUSH_EMAIL_ENABLED == 'true' }}
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
       - name: Send push notification email
-        uses: dawidd6/action-send-mail@v3.12.0
+        uses: hyperpolymath/smtp-notify-action@v0.2.0 # NOSONAR — pin authority is actions.lock (sha1-ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7)
         with:
           server_address: ${{ secrets.SMTP_HOST }}
           server_port: ${{ secrets.SMTP_PORT }}