如何将构建时配置传递给heroku容器构建脚本

Question

我有一个Dockerfile，因此：

# Use a multi-stage build to handle the compiling, installing, etc.
# STAGE 1: Install node_modules on a stretch container
FROM node:10-stretch as base
ARG APP_DIR=/node
EXPOSE 3000
WORKDIR $APP_DIR
RUN chown node:node $APP_DIR
COPY --chown=node:node package*.json ./
USER node
RUN ["npm", "install", "--no-optional"]
COPY --chown=node:node . .
# STAGE 2: Extend the base image as a builder image
FROM base as builder
ARG APP_NAME
ARG BASE_URL
ARG NODE_ENV
RUN npm run build -- --mode=production && rm -rf node_modules && npm install --no-optional --production
# STAGE 3: Copy the 'build' directory from previous stage and run in alpine
# Since this does not extend the base image, we need to set workdir, user, etc. again.
FROM node:10-alpine
ARG APP_DIR=/node
EXPOSE 3000
WORKDIR ${APP_DIR}
COPY --from=builder --chown=node:node $APP_DIR/dist .
COPY --from=builder --chown=node:node $APP_DIR/node_modules ./node_modules
USER node
CMD ["node", "./server"]

我想做的是让Heroku在构建时设置阶段2中的这些环境变量。如果我在Dockerfile中设置这些值，它们最终会在构建中可用，但除此之外，它们似乎不会从heroku.yml中获得值。

根据这篇文档，我应该能够在heroku.yml中设置这些值，但到目前为止，我还没有成功。我的heroku.yml文件如下所示：

build:
docker:
web: Dockerfile
config:
APP_NAME: My App
BASE_URL: /
NODE_ENV: production

我做错了什么？

Answer 1

我认为有必要重复这样的ARG语句，以便每个构建阶段都可以访问它们：

# All `ARG`s must be referenced appear *before* the first `FROM`
ARG APP_NAME
ARG BASE_URL
ARG NODE_ENV
# STAGE 1: Install node_modules on a stretch container
FROM node:10-stretch as base
# Any subset of the `ARG`s can then be imported into the build stage
ARG APP_DIR
# STAGE 2: Extend the base image as a builder image
FROM base as builder
# Any subset of the `ARG`s can then be imported into the build stage
ARG APP_NAME
ARG BASE_URL
ARG NODE_ENV

# STAGE 3: Copy the 'build' directory from previous stage and run in alpine
FROM node:10-alpine
# Any subset of the `ARG`s can then be imported into the build stage
ARG APP_DIR

注意如果覆盖任何状态下的值，例如ARG APP_NAME=/node，则该值将取代您从环境(从heroku.yml(中获得的值