feat: add newsletter subscription form with validation and feedback t… #3490

Job	Run time
codeql / code-security (python)	2m 10s
codeql / code-security (javascript)	2m 53s
build-containers (autoconf) / build	34s
build-containers (ui) / build	1m 25s
build-containers (bunkerweb) / build	36s
build-containers (scheduler) / build	36s
build-packages (debian) / build	6m 55s
build-packages (fedora) / build	6m 21s
build-packages (fedora-41) / build	6m 47s
build-packages (rhel) / build	6m 54s
build-packages (rhel9) / build	6m 47s
build-packages (ubuntu) / build	6m 14s
build-packages (ubuntu-jammy) / build	6m 14s
push-dev	0s
push-packages (el9, amd64) / push	35s
push-packages (el, amd64) / push	32s
push-packages (fedora, amd64) / push	36s
push-packages (debian, amd64) / push	36s
push-packages (fedora-41, amd64) / push	46s
push-packages (ubuntu, amd64) / push	40s
push-packages (ubuntu-jammy, amd64) / push	35s
	58m 46s

Provide feedback