Shellcheck everything (#10730)

* Shellcheck all shell scripts

* Implement Shellcheck's recommendations

* Shellcheck the distribution-specific files

* Include the distro scripts to trigger action

* Fix array usage (hopefully)

* Use single-quote string

TIL: single quote string in yaml treats everything as literal, but
double quote allows backslash escaping.

* Make all cmake commands use set+-x dance and fix macos getopts line

Make Claude happy

getopts has colon after a command which takes an argument

---------

Co-authored-by: SoftFever <softfeverever@gmail.com>

scripts/DockerBuild.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 SCRIPT_DIR=$(cd -P -- "$(dirname -- "$0")" && printf '%s\n' "$(pwd -P)")
-PROJECT_ROOT=$(dirname "$SCRIPT_DIR")
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
 
 set -x
 # Wishlist hint:  For developers, creating a Docker Compose 
@@ -9,9 +9,9 @@ set -x
 # the simplicity of a single Docker image and a one-time compilation
 # seems better.
 docker build -t orcaslicer \
-  --build-arg USER=$USER \
-  --build-arg UID=$(id -u) \
-  --build-arg GID=$(id -g) \
-  --build-arg NCORES=$NCORES \
+  --build-arg USER="$USER" \
+  --build-arg UID="$(id -u)" \
+  --build-arg GID="$(id -g)" \
+  --build-arg NCORES="$NCORES" \
   -f "$SCRIPT_DIR/Dockerfile" \
-  $PROJECT_ROOT
+  "$PROJECT_ROOT"