refactor: simplify stack templates, move vars into group_vars/alpina

this vault setup for injective sensitive variables uses the approach described in https://docs.ansible.com/ansible/10/tips_tricks/ansible_tips_tricks.html#keep-vaulted-variables-safely-visible

roles/alpina/templates/apps/gitea/.env.gitea.j2

@@ -0,0 +1,29 @@
+GITEA____APP_NAME=CazGitea
+
+# Database
+GITEA__database__DB_TYPE=postgres
+GITEA__database__HOST=db:5432
+GITEA__database__NAME=gitea
+GITEA__database__USER=gitea
+GITEA__database__PASSWD={{ gitea_db_password }}
+
+# Server
+GITEA__server__ROOT_URL=https://gitea.{{ domain }}/
+GITEA__server__DISABLE_SSH=true
+
+# Mail
+GITEA__mailer__ENABLED=true
+GITEA__mailer__SMTP_ADDR=smtp.sendgrid.net
+GITEA__mailer__SMTP_PORT=587
+GITEA__mailer__FROM=gitea@cazzzer.com
+GITEA__mailer__USER=apikey
+GITEA__mailer__PASSWD={{ gitea_sendgrid_api_key }}
+
+# Security
+GITEA__security__SECRET_KEY={{ secret_key }}
+GITEA__security__INTERNAL_TOKEN={{ internal_token }}
+
+GITEA__oauth2__JWT_SECRET={{ jwt_secret }}
+
+# Indexer
+GITEA__indexer__REPO_INDEXER_ENABLED=true