Build when deb/* changes

[schklom]

The build calls to Protonmail's repo and builds from it. When that repo changes (i.e. when deb/* changes), the image should be built again.

Currently, that repo changed a few days ago, and the "build" image has not updated in a year. I don't see a reason to never update the image when the upstream repo updates frequently.

[ShayBox]

I think the build from source workflow has been broken since v3 released and hasn't been fixed, all the actions errored.

[schklom]

@ShayBox @shenxn This patch compiles and produces the images at https://hub.docker.com/r/schklom/protonmail-bridge/tags

Note that I do not do the image scan (to avoid issues), i.e. I remove

protonmail-bridge-docker/.github/workflows/build.yaml

Lines 49 to 68 in 0541f29

	- name: Build image without push to registry
	uses: docker/build-push-action@v2
	with:
	context: ./build
	file: ./build/Dockerfile
	platforms: ${{ env.PLATFORMS }}
	push: true
	tags: localhost:5000/protonmail-bridge:latest
	- name: Scan image
	id: scan
	uses: anchore/scan-action@v2
	with:
	image: localhost:5000/protonmail-bridge:latest
	fail-build: true
	severity-cutoff: critical
	acs-report-enable: true
	- name: Upload Anchore scan SARIF report
	uses: github/codeql-action/upload-sarif@v1
	with:
	sarif_file: ${{ steps.scan.outputs.sarif }}