refactor; swap legacy p7zip for official 7zz #237

Job	Run time
Build Images (Bazzite) / Get Bazzite Images for Build	5s
Build Images (Bluefin) / Get Bluefin Images for Build	4s
Build Images (Bluefin) / Build Bluefin Images (bluefin)	3m 52s
Build Images (Bluefin) / Build Bluefin Images (bluefin-nvidia)	3m 52s
Build Images (Bluefin) / Build Bluefin Images (bluefin-latest)	3m 52s
Build Images (Bluefin) / Build Bluefin Images (bluefin-latest-nvidia)	3m 50s
Build Images (Bluefin) / Build Bluefin Images (bluefin-gdx)	3m 51s
Build Images (Bluefin) / Build Bluefin Images (bluefin-lts)	3m 50s
Build Images (Bazzite) / Build Bazzite Images (bazzite)	3m 46s
Build Images (Bazzite) / Build Bazzite Images (bazzite-nvidia)	3m 47s
Build Images (Bazzite) / Check Build ${{ inputs.image_flavor }} Images Successful	1s
Build Images (Bluefin) / Check Build ${{ inputs.image_flavor }} Images Successful	1s
	30m 51s

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