chore: add Dockerfile (api7#51)

Signed-off-by: Jintao Zhang <[email protected]>

.dockerignore

@@ -0,0 +1,32 @@
+# Include any files or directories that you don't want to be copied to your
+# container here (e.g., local build artifacts, temporary files, etc.).
+#
+# For more help, visit the .dockerignore file reference guide at
+# https://docs.docker.com/engine/reference/builder/#dockerignore-file
+
+**/.DS_Store
+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/bin
+**/charts
+**/docker-compose*
+**/compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+LICENSE
+README.md

Dockerfile

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+# syntax=docker/dockerfile:1
+
+ARG GO_VERSION=1.20
+ARG VERSION=dev
+FROM golang:${GO_VERSION} AS build
+WORKDIR /src
+
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=bind,source=go.sum,target=go.sum \
+    --mount=type=bind,source=go.mod,target=go.mod \
+    go mod download -x
+
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=bind,target=. \
+    CGO_ENABLED=0 go build -o /bin/adc -ldflags "-X github.com/api7/adc/cmd.VERSION=$VERSION -X github.com/api7/adc/cmd.GitRevision=$VERSION" .
+
+FROM alpine:3.18 AS final
+
+# Copy the executable from the "build" stage.
+COPY --from=build --chown=appuser:appuser /bin/adc /bin/
+
+CMD /bin/adc