Added a command line tool for user management (#420)

The CLI tool can be started from the root of the /App directory in the
container with the command:
`./gaseous-cli`

Running without arguments presents the following help screen:
```
Gaseous CLI - A tool for managing the Gaseous Server
Usage: gaseous-cli [command] [options]
Commands:
  user [command] [options] - Manage users
  role [command] [options] - Manage roles
  help - Display this help message
```

build/Dockerfile

@@ -9,11 +9,19 @@ RUN echo "Build: $BUILDPLATFORM"
 
 # Copy everything
 COPY .. ./
+
+# Build Gaseous Web Server
 # Restore as distinct layers
 RUN dotnet restore "gaseous-server/gaseous-server.csproj" -a $TARGETARCH
 # Build and publish a release
 RUN dotnet publish "gaseous-server/gaseous-server.csproj" --use-current-runtime --self-contained true -c Release -o out -a $TARGETARCH
 
+# Build Gaseous CLI
+# Restore as distinct layers
+RUN dotnet restore "gaseous-cli/gaseous-cli.csproj" -a $TARGETARCH
+# Build and publish a release
+RUN dotnet publish "gaseous-cli/gaseous-cli.csproj" --use-current-runtime --self-contained true -c Release -o out -a $TARGETARCH
+
 # update apt-get
 RUN apt-get update
 

build/Dockerfile-EmbeddedDB

@@ -9,11 +9,19 @@ RUN echo "Build: $BUILDPLATFORM"
 
 # Copy everything
 COPY .. ./
+
+# Build Gaseous Web Server
 # Restore as distinct layers
 RUN dotnet restore "gaseous-server/gaseous-server.csproj" -a $TARGETARCH
 # Build and publish a release
 RUN dotnet publish "gaseous-server/gaseous-server.csproj" --use-current-runtime --self-contained true -c Release -o out -a $TARGETARCH
 
+# Build Gaseous CLI
+# Restore as distinct layers
+RUN dotnet restore "gaseous-cli/gaseous-cli.csproj" -a $TARGETARCH
+# Build and publish a release
+RUN dotnet publish "gaseous-cli/gaseous-cli.csproj" --use-current-runtime --self-contained true -c Release -o out -a $TARGETARCH
+
 # update apt-get
 RUN apt-get update