sample_spec_env_var.yaml

# Simple spec.yaml with the use of parameters for substituion

build:
  templates:
    - name: go-build-template
      cmd:
        - docker:
            inline:
              - ADD . /src
              - RUN cd /src && go build -o goapp
  steps:
    - metadata:
        # Name will be updated by the value in environment variable $BUILD_DEV by our second param definition
        name: <UPDATED_NAME>
      stages:
        - metadata:
            name: build-env
          base:
            image: golang
            platform: alpine
          template: go-build-template
        - metadata:
            name: alpine-stage
          base:
            image: alpine
          cmd:
            - docker:
                inline:
                  - WORKDIR /app
                  - COPY --from=build-env /src/goapp /app/
                  - ENTRYPOINT ./goapp
      # Tag will be updated to v0.2.0 by our first param definition
      tag: <UPDATED_TAG>
      purge: false

# Params allow you to specify fields and values to update in the above specification
params:
  # Replaces the value in location build.steps.0.tag with the value v0.2.0
  - dest: build.steps.0.tag
    value: v0.2.0
  # Replaces the value in location build.steps.0.metadata.name with the environment variable $BUILD_DEV
  - dest: build.steps.0.metadata.name
    # ValueFromEnv is the environment variable name whose value will be used at the above destination
    valueFromEnv: BUILD_DEV