feat: send email notifications for missed messages

- New cron job in cluster
- Handle presence and other concerns
- Toggle in app to disable email notifications
- Handles other edge cases such as cooldown period
- Simple html email with simple message

Closes #117

go/skaffold.yaml

@@ -93,6 +93,41 @@ profiles:
 ---
 apiVersion: skaffold/v4beta11
 kind: Config
+metadata:
+  name: emailnotifierjob
+build:
+  local: {}
+  tagPolicy:
+    gitCommit:
+      variant: AbbrevCommitSha
+profiles:
+  - name: dev
+    build:
+      artifacts:
+      - image: emailnotifierjob
+        context: .
+        docker:
+          dockerfile: Dockerfile.emailnotifierjob
+    manifests:
+      rawYaml:
+      - k8s/dev/emailnotifierjob.yaml
+    deploy:
+      kubectl: {}
+  - name: prod
+    build:
+      artifacts:
+      - image: emailnotifierjob
+        context: .
+        docker:
+          dockerfile: Dockerfile.emailnotifierjob
+    manifests:
+      rawYaml:
+      - k8s/prod/emailnotifierjob.yaml
+    deploy:
+      kubectl: {}
+---
+apiVersion: skaffold/v4beta11
+kind: Config
 metadata:
   name: pusher
 build: