added deploy to DO button

.do/deploy.template.yaml

@@ -0,0 +1,33 @@
+spec:
+  name: altair-graphql-api
+  services:
+    - name: api
+      git:
+        branch: master
+        repo_clone_url: https://github.com/altair-graphql/altair.git
+      envs:
+      - key: JWT_ACCESS_SECRET
+        scope: RUN_TIME
+      - key: EVENTS_JWT_ACCESS_SECRET
+        scope: RUN_TIME
+      - key: JWT_REFRESH_SECRET
+        scope: RUN_TIME
+      - key: GOOGLE_OAUTH_CLIENT_ID
+        scope: RUN_TIME
+      - key: GOOGLE_OAUTH_CLIENT_SECRET
+        scope: RUN_TIME
+      - key: POSTGRES_DB
+        scope: RUN_TIME
+      - key: POSTGRES_USER
+        scope: RUN_TIME
+      - key: POSTGRES_PASSWORD
+        scope: RUN_TIME
+      - key: DATABASE_URL
+        scope: RUN_TIME
+        value: ${postgresdb.DATABASE_URL}
+      - key: STRIPE_SECRET_KEY
+        scope: RUN_TIME
+      - key: STRIPE_WEBHOOK_SECRET
+        scope: RUN_TIME
+    databases:
+    - name: postgresdb

README.md

@@ -204,6 +204,9 @@ Read more [here](.github/development.md).
 #### Docker
 The docker image can be built from the [Dockerfile](./Dockerfile) at the root of the repo.
 
+#### Digitalocean
+[![Deploy to DO](https://www.deploytodo.com/do-btn-blue.svg)](https://cloud.digitalocean.com/apps/new?repo=https://github.com/altair-graphql/altair/tree/master)
+
 #### Vercel
 [![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https%3A%2F%2Fgithub.com%2Faltair-graphql%2Faltair&env=JWT_ACCESS_SECRET,EVENTS_JWT_ACCESS_SECRET,JWT_REFRESH_SECRET,GOOGLE_OAUTH_CLIENT_ID,GOOGLE_OAUTH_CLIENT_SECRET,POSTGRES_DB,POSTGRES_USER,POSTGRES_PASSWORD,DATABASE_URL,STRIPE_SECRET_KEY&project-name=altair-graphql-api&redirect-url=https%3A%2F%2Faltairgraphql.dev%2F)