dockerfile frontend examples

dockerfiles/frontends/v1.4-heredocs/Dockerfile

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+# syntax=docker/dockerfile:1.4
+FROM ubuntu as old-way
+
+RUN apt-get update && \
+ apt-get install -y curl && \
+  apt-get clean
+
+
+FROM ubuntu as new-way
+
+RUN <<EOF
+apt-get update
+apt-get install -y curl
+EOF

dockerfiles/frontends/v1.4-link/Dockerfile

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+# syntax=docker/dockerfile:1.4
+# COPY/ADD can now include files in a layer without invalidating layer cache
+
+# Example 1: if images change, RUN layer isn't re-run
+# Example 2: if only a --link layer needs updating, FROM and other layers aren't needed in cache
+
+FROM alpine as stage1
+
+# if these files change, the RUN layer below is still valid and cache is used
+COPY /static/images /app/images
+
+
+FROM alpine as stage2
+
+# If this line changes, the COPY --link isn't affected
+RUN apk add --no-cache curl
+
+
+COPY --link --from=stage1 /app/images /app/images

dockerfiles/frontends/v1.6-add-git/Dockerfile

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+# syntax=docker/dockerfile:1.6
+# ADD can now clone git repos without git installed
+# https://docs.docker.com/engine/reference/builder/#adding-a-git-repository-add-git-ref-dir
+
+#######
+# EXAMPLE 1
+#######
+FROM alpine as clone-public-repo
+
+# clone public git repo
+# also keep the .git directory, which is off by default
+ADD --keep-git-dir=true https://github.com/moby/buildkit.git#v0.10.1 /buildkit
+
+#######
+# EXAMPLE 2
+#######
+FROM alpine as clone-private-repo
+
+# clone private git repo
+# This assumes you have a ssh key that's needed to access the private repo
+# use `docker build --ssh default .` to pass the ssh-agent keys
+ADD [email protected]:BretFisher/autodeploy.git /autodeploy