Add gitea and drone configs

docker/drone/README.md

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+Add a `.env` file like this:
+
+```
+DRONE_GITEA_CLIENT_ID=...
+DRONE_GITEA_CLIENT_SECRET=...
+DRONE_RPC_SECRET=...
+```
+
+See also: https://docs.drone.io/server/provider/gitea/.

docker/drone/docker-compose.yaml

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+version: "3"
+
+services:
+  drone:
+    image: drone/drone:2
+    environment:
+      DRONE_GITEA_SERVER: https://git.pbrinkmeier.de
+      DRONE_GITEA_CLIENT_ID: "${DRONE_GITEA_CLIENT_ID}"
+      DRONE_GITEA_CLIENT_SECRET: "${DRONE_GITEA_CLIENT_SECRET}"
+      DRONE_RPC_SECRET: "${DRONE_RPC_SECRET}"
+      DRONE_SERVER_HOST: ci.pbrinkmeier.de
+      DRONE_SERVER_PROTO: https
+    volumes:
+      - /var/lib/pbri/docker/drone:/data
+    restart: always
+
+  drone_runner:
+    image: drone/drone-runner-docker:1
+    environment:
+      DRONE_RPC_PROTO: https
+      DRONE_RPC_HOST: ci.pbrinkmeier.de
+      DRONE_RPC_SECRET: "${DRONE_RPC_SECRET}"
+      DRONE_RUNNER_CAPACITY: 1
+      DRONE_RUNNER_NAME: shamash
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    restart: always
+
+networks:
+  default:
+    name: caddy-network
+    external: true

docker/gitea/README.md

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+Add a `.env` file like this:
+
+```
+GITEA_DB_PASSWORD=...
+GITEA_SMTP_PASSWORD=...
+```