scripts: restore provision_mac.sh (removed in #1275) and remove docker scripts (#1299)

* Fixes #1297.

Author: kkysen

docker/.dockerignore

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# complain if we're not on macOS
+UNAME=$(uname -s)
+if [ "$UNAME" != "Darwin" ]; then
+  echo >&2 "Run this script on a macOS host."; exit 1;
+fi
+
+# make sure we have all prerequisites
+prereqs=(brew clang)
+for prereq in "${prereqs[@]}"; do
+    type -P "$prereq" >/dev/null || {
+        echo >&2 "$prereq not in path."; exit 1;
+    }
+done
+
+SCRIPT_DIR="$(dirname "$0")"
+export HOMEBREW_NO_AUTO_UPDATE=1
+
+# NOTE: Pin LLVM to a known good version since new releases
+# tend not to be backwards compatible
+# `bash` needed b/c macOS ships with bash 3, which doesn't support arrays properly
+brew install -q python cmake ninja gpg llvm@17 bash
+
+# Python 3 packages
+python3 -m pip install --user --upgrade pip
+python3 -m pip install --user -r "$SCRIPT_DIR/requirements.txt"
+
+# Rust and dependencies
+RUST_TOOLCHAIN_FILE="$SCRIPT_DIR/../rust-toolchain.toml"
+export RUST_VER=$($SCRIPT_DIR/query_toml.py toolchain.channel $RUST_TOOLCHAIN_FILE)
+"$SCRIPT_DIR/provision_rust.sh"