Use busybox image with ADD command (#34)

Author: bonddim

Dockerfile

@@ -1,9 +1,8 @@
-FROM --platform=${BUILDPLATFORM} alpine:3 AS tools
+FROM --platform=${BUILDPLATFORM} busybox:stable AS tools
 ARG SQLCMD_VERSION=v1.9.0
 ARG TARGETARCH
-RUN apk add --update-cache --no-cache curl jq xz && \
-  curl -sSL https://github.com/microsoft/go-sqlcmd/releases/download/${SQLCMD_VERSION}/sqlcmd-linux-${TARGETARCH}.tar.bz2 \
-  | tar -xj
+ADD https://github.com/microsoft/go-sqlcmd/releases/download/${SQLCMD_VERSION}/sqlcmd-linux-${TARGETARCH}.tar.bz2 sqlcmd.tar.bz2
+RUN tar -xvf sqlcmd.tar.bz2
 
 FROM gcr.io/distroless/static:nonroot@sha256:e8a4044e0b4ae4257efa45fc026c0bc30ad320d43bd4c1a7d5271bd241e386d0
 COPY --from=tools /sqlcmd /sqlcmd