Drone uses the `build` section of the `.drone.yml` to describe your Docker build environment and specify your build and test instructions. The following is an example build definition:
```yaml
build:
image: golang
environment:
- GOBIN=/drone/bin
commands:
- go get
- go build
- go test
```
## Build options
The build configuration options:
*`image` - any valid Docker image name
*`pull` - if true, will always attempt to pull the latest image
*`environment` - list of environment variables, declared in `name=value` format
*`privileged` - if true, runs the container with extended privileges [1]
*`volumes` - list of bind mounted volumes on the host machine [1]
*`net` - sets the container [network mode](https://docs.docker.com/articles/networking/#container-networking) [1]
*`commands` - list of build commands
[1] Some build options are disabled for security reasons, including `volumes`, `privileged` and `net`. To enable these options, a system administrator must white-list your repository as trusted. This can be done via the repository settings screen.
## Build image
The `image` attribute supports any valid Docker image name:
```yaml
# Docker library image
image: golang
# Docker library image, with tag
image: golang:1.4
# Docker image, full name, with tag
image: library/golang:1.4
# fully qualified Docker image URI, with tag
image: index.docker.io/library/golang:1.4
```
## Skipping builds
Skip a build by including the text `[CI SKIP]` in your commit message.
