Shell Check fixes

.devcontainer/resources/devcontainer-Dockerfile

@@ -22,7 +22,7 @@ USER root
 # Install common tools, create user, and set up sudo
 RUN apk add --no-cache git nano vim jq php83-pecl-xdebug py3-pip nodejs sudo gpgconf pytest \
     pytest-cov zsh alpine-zsh-config shfmt github-cli py3-yaml py3-docker-py docker-cli docker-cli-buildx \
-    docker-cli-compose
+    docker-cli-compose shellcheck
 
 RUN install -d -o netalertx -g netalertx -m 755 /services/php/modules && \
     cp -a /usr/lib/php83/modules/. /services/php/modules/ && \