Do not re-create image file if no changes, and silence output if noth… #6

	name: Build firmware

	on:
	workflow_dispatch:
	push:

	jobs:
	build:
	strategy:
	matrix:
	gcc: ['12.2.Rel1', '13.2.Rel1']
	name: "Build firmware"
	runs-on: ubuntu-latest
	steps:
	- name: Install Arm GNU Toolchain (arm-none-eabi-gcc)
	uses: carlosperate/arm-none-eabi-gcc-action@v1
	with:
	release: ${{ matrix.gcc }}

	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: 'recursive'

	- name: Build
	run: make all

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