feat: instance created notification email template with nicer body

infrastructure/templates/infrastructure/emails/instance-created.txt

@@ -0,0 +1,11 @@
+Hello {{ username }}!,
+
+The deployment job has run to completion and your Hostea instance is now online!
+Credentials to admin account was sent in an earlier email, please contact
+support if didn't receive it.
+
+Gitea: {{ gitea_uri }}
+Woodpecker CI: {{ woodpecker_uri }}
+
+Cheers,
+Hostea team

infrastructure/utils.py

@@ -53,19 +53,23 @@ class Worker(Thread):
         job = self.job
         self.job = None
         email = job.instance.owned_by.email
+
+        ctx = {
+            "gitea_uri": gitea_uri,
+            "woodpecker_uri": woodpecker,
+            "username": job.instance.owned_by.username,
+        }
+        body = render_to_string(
+            "infrastructure/emails/instance-created.txt",
+            context=ctx,
+        )
+
+        sender = settings.HOSTEA["EMAIL_SENDER_ADDRESS"]
+
         send_mail(
             subject="[Hostea] Your Hostea instance is now online!",
-            message=f"""
-Hello,
-
-The deployment job has run to completion and your Hostea instance is now online!
-Credentials to admin account was sent in an earlier email, please contact
-support if didn't receive it.
-
-Gitea: {gitea_uri}
-Woodpecker CI: {woodpecker}
-""",
-            from_email="No reply Hostea<no-reply@exampl.org>",  # TODO read from settings.py
+            message=body,
+            from_email=f"No reply Hostea<{sender}>",  # TODO read from settings.py
             recipient_list=[email],
         )
         job.delete()