feat: dockerfile (#3)

.dockerignore

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+.dockerignore
+.git
+.github
+Dockerfile

Dockerfile

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+# Copyright Josh Komoroske. All rights reserved.
+# Use of this source code is governed by the MIT license,
+# a copy of which can be found in the LICENSE.txt file.
+# SPDX-License-Identifier: MIT
+
+# The certs stage is used to obtain a current set of CA certificates.
+FROM alpine:3.14 as certs
+
+# hadolint ignore=DL3018
+RUN apk add --no-cache \
+    ca-certificates
+
+# The builder build stage compiles the Go code into a static binary.
+FROM golang:1.16-alpine as builder
+
+ARG VERSION=development
+
+WORKDIR /go/src/github.com/joshdk/drone-skip-pipeline
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -o /bin/drone-skip-pipeline \
+    -ldflags "-s -w" \
+    -trimpath \
+    main.go
+
+# The upx build stage uses upx to compress the binary.
+FROM alpine:3.14 as upx
+
+RUN wget https://github.com/upx/upx/releases/download/v3.96/upx-3.96-amd64_linux.tar.xz \
+ && tar -xf upx-3.96-amd64_linux.tar.xz \
+ && install upx-3.96-amd64_linux/upx /bin/upx \
+ && rm -rf upx*
+
+COPY --from=builder /bin/drone-skip-pipeline /bin/drone-skip-pipeline
+
+RUN upx --best --ultra-brute /bin/drone-skip-pipeline
+
+# The final build stage copies in the final binary.
+FROM scratch
+
+ARG CREATED
+ARG REVISION
+ARG VERSION
+
+MAINTAINER Josh Komoroske <github.com/joshdk>
+
+# Standard OCI image labels.
+# See: https://github.com/opencontainers/image-spec/blob/v1.0.1/annotations.md#pre-defined-annotation-keys
+LABEL org.opencontainers.image.created="$CREATED"
+LABEL org.opencontainers.image.authors="Josh Komoroske <github.com/joshdk>"
+LABEL org.opencontainers.image.url="https://github.com/joshdk/drone-skip-pipeline"
+LABEL org.opencontainers.image.documentation="https://github.com/joshdk/drone-skip-pipeline/blob/master/README.md"
+LABEL org.opencontainers.image.source="https://github.com/joshdk/drone-skip-pipeline"
+LABEL org.opencontainers.image.version="$VERSION"
+LABEL org.opencontainers.image.revision="$REVISION"
+LABEL org.opencontainers.image.vendor="Josh Komoroske <github.com/joshdk>"
+LABEL org.opencontainers.image.licenses="MIT"
+LABEL org.opencontainers.image.ref.name="ghcr.io/joshdk/drone-skip-pipeline:$VERSION"
+LABEL org.opencontainers.image.title="DroneCI Skip Pipeline"
+LABEL org.opencontainers.image.description="DroneCI plugin to skip pipelines based on files changes"
+
+COPY LICENSE.txt /
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY README.md /
+COPY --from=upx /bin/drone-skip-pipeline /bin/drone-skip-pipeline
+
+# Switch to a non-root user. Arbitrarily, use the same uid/gid as the "nobody"
+# user from Alpine.
+USER 65534:65534
+
+ENTRYPOINT ["/bin/drone-skip-pipeline"]