Add installation instructions for HACS in Home Assistant Docker

install-hacs-in-home-assistant-docker/README.md

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+# Run command
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/install-hacs-in-home-assistant-docker/run.sh)"
+```

install-hacs-in-home-assistant-docker/run.sh

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+#!/bin/bash
+
+# Check if Docker is installed by attempting to run the 'docker' command.
+# If Docker is not found, print an error message and exit the script.
+if ! command -v docker &> /dev/null; then
+    echo "Docker could not be found. Please install Docker first."
+    exit 1
+fi
+
+# Get a list of all running Docker containers.
+# The format "{{.Names}}" specifies that we only want the names of the containers.
+# 'mapfile -t CONTAINERS' reads the input into an array named CONTAINERS.
+mapfile -t CONTAINERS < <(docker ps --format "{{.Names}}")
+
+# Check if there are any running containers. If not, print an error message and exit.
+if [ ${#CONTAINERS[@]} -eq 0 ]; then
+    echo "No running containers found."
+    exit 1
+fi
+
+# Display a prompt for the user to select a Docker container.
+# Loop through the CONTAINERS array and print each container with a number prefix.
+echo "Please select a Docker container to run the HACS download script in:"
+for i in "${!CONTAINERS[@]}"; do
+    echo "$((i+1))) ${CONTAINERS[$i]}"
+done
+
+# Prompt the user to enter the number of the container they wish to select.
+read -p "Enter the number of the container: " USER_CHOICE
+
+# Decrement USER_CHOICE by 1 because array indices start at 0 but we showed the user a list starting at 1.
+((USER_CHOICE--))
+
+# Validate the user's selection. If the choice is outside the range of available containers, print an error and exit.
+if [ "$USER_CHOICE" -lt 0 ] || [ "$USER_CHOICE" -ge "${#CONTAINERS[@]}" ]; then
+    echo "Invalid selection."
+    exit 1
+fi
+
+# Retrieve the name of the selected container from the CONTAINERS array.
+CONTAINER_NAME=${CONTAINERS[$USER_CHOICE]}
+
+# Execute the HACS download script inside the selected Docker container.
+# We use 'docker exec' to run commands inside the container.
+# The '-it' flags attach us interactively to the container.
+# 'bash -c' is used to run the subsequent string as a command in bash inside the container.
+docker exec -it $CONTAINER_NAME bash -c "wget -O - https://get.hacs.xyz | bash -"
+
+# Print a confirmation message that the script has been executed in the selected container.
+echo "HACS download script has been executed inside the '$CONTAINER_NAME' container."