add Dockerfile for building with HSM support

docker/Dockerfile.step-ca.hsm

@@ -0,0 +1,33 @@
+FROM golang:alpine AS builder
+
+WORKDIR /src
+COPY . .
+
+RUN apk add --no-cache curl git make
+RUN apk add --no-cache gcc musl-dev pkgconf pcsc-lite-dev
+RUN make V=1 GOFLAGS="" build
+
+FROM smallstep/step-cli:latest
+
+COPY --from=builder /src/bin/step-ca /usr/local/bin/step-ca
+COPY --from=builder /src/bin/step-awskms-init /usr/local/bin/step-awskms-init
+COPY --from=builder /src/bin/step-cloudkms-init /usr/local/bin/step-cloudkms-init
+COPY --from=builder /src/bin/step-pkcs11-init /usr/local/bin/step-pkcs11-init
+COPY --from=builder /src/bin/step-yubikey-init /usr/local/bin/step-yubikey-init
+
+USER root
+RUN apk add --no-cache libcap && setcap CAP_NET_BIND_SERVICE=+eip /usr/local/bin/step-ca
+RUN apk add --no-cache pcsc-lite-libs
+USER step
+
+ENV CONFIGPATH="/home/step/config/ca.json"
+ENV PWDPATH="/home/step/secrets/password"
+
+VOLUME ["/home/step"]
+STOPSIGNAL SIGTERM
+HEALTHCHECK CMD step ca health 2>/dev/null | grep "^ok" >/dev/null
+
+COPY docker/entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/bin/bash", "/entrypoint.sh"]
+CMD exec /usr/local/bin/step-ca --password-file $PWDPATH $CONFIGPATH