[add] docker publish

Dockerfile-BuildKit

@@ -0,0 +1,28 @@
+# Certificate Store
+FROM alpine AS certs
+RUN apk update && apk add ca-certificates
+
+# Build Image
+FROM --platform=$BUILDPLATFORM golang:1.20 AS build
+
+# Create Package Directory
+WORKDIR /src
+RUN mkdir -p /opt/bookmanager
+
+# Cache Dependencies & Compile
+ARG TARGETOS
+ARG TARGETARCH
+RUN --mount=target=. \
+    --mount=type=cache,target=/root/.cache/go-build \
+    --mount=type=cache,target=/go/pkg \
+    GOOS=$TARGETOS GOARCH=$TARGETARCH go build -o /opt/bookmanager/server; \
+    cp -a ./templates /opt/bookmanager/templates; \
+    cp -a ./assets /opt/bookmanager/assets;
+
+# Create Image
+FROM busybox:1.36
+COPY --from=certs /etc/ssl/certs /etc/ssl/certs
+COPY --from=build /opt/bookmanager /opt/bookmanager
+WORKDIR /opt/bookmanager
+EXPOSE 8585
+ENTRYPOINT ["/opt/bookmanager/server", "serve"]