tweak the docker release flows

docker/build-server.bash

@@ -0,0 +1,34 @@
+#!/bin/bash
+# This file is part of Moonfire NVR, a security camera network video recorder.
+# Copyright (C) 2021 The Moonfire NVR Authors; see AUTHORS and LICENSE.txt.
+# SPDX-License-Identifier: GPL-v3.0-or-later WITH GPL-3.0-linking-exception.
+
+# Build the "build-server" target. See Dockerfile.
+
+set -o errexit
+set -o pipefail
+set -o xtrace
+
+mkdir /docker-build-debug/build-server
+exec > >(tee -i /docker-build-debug/build-server/output) 2>&1
+ls -laFR /cargo-cache > /docker-build-debug/build-server/cargo-cache-before
+ls -laFR /var/lib/moonfire-nvr/target \
+    > /docker-build-debug/build-server/target-before
+
+source ~/.buildrc
+
+# The "mode" argument to cache mounts doesn't seem to work reliably
+# (as of Docker version 20.10.5, build 55c4c88, using a docker-container
+# builder), thus the chmod command.
+sudo chmod 777 /cargo-cache /var/lib/moonfire-nvr/target
+mkdir -p /cargo-cache/{git,registry}
+ln -s /cargo-cache/{git,registry} ~/.cargo
+
+cd src/server
+time cargo test
+time cargo build --release
+sudo install -m 755 ~/moonfire-nvr /usr/local/bin/moonfire-nvr
+
+ls -laFR /cargo-cache > /docker-build-debug/build-server/cargo-cache-after
+ls -laFR /var/lib/moonfire-nvr/target \
+    > /docker-build-debug/build-server/target-after