Add gitea-postgres sample

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

gitea-postgres/README.md

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+## Gitea with PostgreSQL
+This example defines one of the base setups for Gitea. More details on how to customize the installation and the compose file can be found in [Gitea documentation](https://docs.gitea.io/en-us/install-with-docker/).
+
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+└── README.md
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  gitea:
+    image: gitea/gitea:latest
+    ports:
+      - 80:3000
+    ...
+  db:
+    image: postgres:alpine
+    environment:
+    ...
+```
+
+When deploying this setup, docker-compose maps the nextcloud container port 3000 to
+port 80 of the host as specified in the compose file.
+
+## Deploy with docker-compose
+
+```
+$ docker$ compose up -d
+Creating network "gitea-postgres_default" with the default driver
+Creating gitea-postgres_db_1 ... done
+Creating gitea-postgres_gitea_1 ... done
+Attaching to gitea-postgres_db_1, gitea-postgres_gitea_1
+....
+Starting gitea-postgres_db_1 ... done
+Starting gitea-postgres_gitea_1 ... done
+```
+
+
+## Expected result
+
+Check containers are running and the port mapping:
+```
+$ docker ps
+CONTAINER ID        IMAGE                COMMAND                  CREATED             STATUS              PORTS                          NAMES
+2f5624043da9        gitea/gitea:latest   "/usr/bin/entrypoint…"   56 seconds ago      Up 16 seconds       22/tcp, 0.0.0.0:80->3000/tcp   gitea-postgres_gitea_1
+86acc768453e        postgres:alpine      "docker-entrypoint.s…"   57 seconds ago      Up 17 seconds       5432/tcp                       gitea-postgres_db_1
+```
+
+Navigate to `http://localhost:80` in your web browser to access the installed
+Gitea service.
+
+![page](output.jpg)
+
+Stop and remove the containers
+
+```
+$ docker-compose down
+```
+
+To remove all Gitea data, delete the named volumes by passing the `-v` parameter:
+```
+$ docker-compose down -v
+```

gitea-postgres/docker-compose.yaml

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+version: '3.7'
+services:
+  gitea:
+    image: gitea/gitea:latest
+    environment:
+      - DB_TYPE=postgres
+      - DB_HOST=db:5432
+      - DB_NAME=gitea
+      - DB_USER=gitea
+      - DB_PASSWD=gitea
+    restart: always
+    volumes:
+      - git_data:/data
+    ports:
+      - 80:3000
+    depends_on: 
+      - db
+  db:
+    image: postgres:alpine
+    environment:
+      - POSTGRES_USER=gitea
+      - POSTGRES_PASSWORD=gitea
+      - POSTGRES_DB=gitea
+    restart: always
+    volumes:
+      - db_data:/var/lib/postgresql/data
+volumes:
+  db_data:
+  git_data:
+  
+  
+