Add dependencies script to building docs

Signed-off-by: RaspberryPiNews <raspberrypinews@noreply.thebrokenrail.org>

docs/BUILDING.md

@@ -41,6 +41,9 @@
 Use this when the host architecture is not ARM.
 
 ```sh
+# Install dependencies
+ARM_PACKAGES_SUPPORTED=1 ./scripts/install-dependencies.sh
+
 # Create Build Directory
 mkdir build && cd build
 
@@ -63,6 +66,9 @@ This will most likely not compile by itself. You will want to enable either serv
 Use this when the host architecture is ARM.
 
 ```sh
+# Install dependencies
+./scripts/install-dependencies.sh
+
 # Create Build Directory
 mkdir build && cd build
 
@@ -71,3 +77,10 @@ cmake ..
 make -j$(nproc) && sudo make install
 cd ../
 ```
+
+## Docker Build
+Alternatively, if you have Docker installed you can build reborn in a container.
+
+```sh
+./scripts/ci/simulate.sh
+```