Update CI to use custom mailer image

.woodpecker/test.yml

@@ -8,23 +8,23 @@ pipeline:
   #     - cmake --build . --parallel $(nproc) --target all
   #     - ctest
   notify:
-    image: drillster/drone-email
-    settings:
-      from.address:
-        from_secret: EMAIL_ADDRESS
-      from.name:
-        from_secret: EMAIL_SENDER
-      host:
-        from_secret: EMAIL_HOST
-      port:
-        from_secret: EMAIL_PORT
-      username:
-        from_secret: EMAIL_USERNAME
-      password:
-        from_secret: EMAIL_PASSWORD
-      no_starttls: true
-      recipients:
-        - i@sainnhe.dev
+    image: sainnhe/mailer
+    commands:
+      - mailer
+    secrets:
+      [
+        MAILER_FROM_ADDRESS,
+        MAILER_FROM_NAME,
+        MAILER_RECIPIENTS,
+        MAILER_USER_NAME,
+        MAILER_PASSWORD,
+        MAILER_HOST,
+        MAILER_PORT,
+        MAILER_USE_STARTTLS,
+      ]
+    environment:
+      - MAILER_SUBJECT="Run Failed"
+      - MAILER_BODY=${CI_BUILD_LINK}
     # when:
     #   status:
     #     - failure