testing/ghostty: purge some cache, very selectively

This addresses builder failures: https://build.alpinelinux.org/buildlogs/build-edge-x86_64/testing/ghostty/ghostty-1.1.2_git20250311-r0.log

testing/ghostty/APKBUILD

@@ -43,6 +43,21 @@ source="
 	0001-ReleaseSafe-is-not-debug.patch
 	"
 
+prepare() {
+	default_prepare
+
+	# These are unused in our builds, but if already downloaded into cache, they can cause errors
+	rm -rf ~/.cache/zig/p/12205a66d423259567764fa0fc60c82be35365c21aeb76c5a7dc99698401f4f6fefc
+	rm -rf ~/.cache/zig/p/12206ed982e709e565d536ce930701a8c07edfd2cfdce428683f3f2a601d37696a62
+	rm -rf ~/.cache/zig/p/1220e17e64ef0ef561b3e4b9f3a96a2494285f2ec31c097721bf8c8677ec4415c634
+	rm -rf ~/.cache/zig/p/12205a66d423259567764fa0fc60c82be35365c21aeb76c5a7dc99698401f4f6fefc
+	rm -rf ~/.cache/zig/p/12207831bce7d4abce57b5a98e8f3635811cfefd160bca022eb91fe905d36a02cf25
+	rm -rf ~/.cache/zig/p/12202cdac858abc52413a6c6711d5026d2d3c8e13f95ca2c327eade0736298bb021f
+	rm -rf ~/.cache/zig/p/12201a57c6ce0001aa034fa80fba3e1cd2253c560a45748f4f4dd21ff23b491cddef
+	rm -rf ~/.cache/zig/p/12207e0851c12acdeee0991e893e0132fc87bb763969a585dc16ecca33e88334c566
+	rm -rf ~/.cache/zig/p/122071ad56fd984afb4f94d441b6ea3e21f1741a0e026b02860d9a46110fac2cd109
+}
+
 build() {
 	zig build \
 		--release=safe \