feat: Allow users to override secure boot key and password (#40)

* feat: Allow users to override secure boot key and password when using container or action

* fix: follow redirects

* chore: update docs

* fix: added comments and removed additional \n

* fix: removed defaults

* fix: added conditional for adding public key

* chore(ci): Added additional test for secure boot

* chore(ci): fixed up workflows to match production

* fix(ci): added workflow dispatch to test

* fix(ci): fixed version and added IMAGE_TAG

* chore(ci): changed to bluefin to test both 38 and 39 secure boot

* chore(ci): added required variables to entrypoint

* chore(ci): added merge_group and added paths-ignore

* chore(ci): updated description

* chore(ci): set to Silverblue since we are testing Bluefin

* chore(ci): Fixed secure boot key not found error

Received error in anaconda when check was hit, need to set as a soft failure to exit the script early without stopping anaconda installation.

* chore: fixed formatting

* chore: fixed whitespace

* chore(ci): Removed duplicate test

* chore: fix whitespace

* chore(ci): fixed test and removed upload to Github Artifacts

* chore: updated README

* fix: set password to ublue default

* fix: changed enrollment password in containerfile

Containerfile

@@ -13,6 +13,8 @@ ENV IMAGE_TAG="${VERSION}"
 ENV VARIANT="Kinoite"
 ENV VERSION="${VERSION}"
 ENV WEB_UI="false"
+ENV SECURE_BOOT_KEY_URL=""
+ENV ENROLLMENT_PASSWORD="ublue-os"
 
 COPY / /isogenerator
 WORKDIR /isogenerator