Add GOARM64 and GORISCV64 values to our versions.json

These are (currently) unused, so this is simply added data for completeness (as evidenced by the lack of generated `Dockerfile` changes).

This will matter more if/when we implement tip (although these values are currently the default values anyhow, so this is just being completely explicit in case those defaults ever change to match the weird way `GOARM` works with a default value on *some* platforms but a detected value on others).

versions.json

@@ -455,7 +455,8 @@
         "sha256": "62788056693009bcf7020eedc778cdd1781941c6145eab7688bd087bce0f8659",
         "env": {
           "GOOS": "linux",
-          "GOARCH": "arm64"
+          "GOARCH": "arm64",
+          "GOARM64": "v8.0"
         },
         "supported": true
       },
@@ -735,7 +736,8 @@
         "sha256": "a87726205f1a283247f877ccae8ce147ff4e77ac802382647ac52256eb5642c7",
         "env": {
           "GOOS": "linux",
-          "GOARCH": "riscv64"
+          "GOARCH": "riscv64",
+          "GORISCV64": "rva20u64"
         },
         "supported": true
       },

versions.sh

@@ -140,11 +140,18 @@ for version in "${versions[@]}"; do
 							# i386 in Debian is non-SSE2, Alpine appears to be similar (but interesting, not FreeBSD?)
 							{ GOARCH: "386", GO386: "softfloat" }
 						elif $bashbrewArch == "amd64" then
-							# https://tip.golang.org/doc/go1.18#amd64
+							# https://go.dev/doc/go1.18#amd64
 							{ GOAMD64: "v1" }
 						# TODO ^^ figure out what to do with GOAMD64 / GO386 if/when the OS baselines change and these choices needs to be per-variant /o\ (probably move it to the template instead, in fact, since that is where we can most easily toggle based on variant)
+						elif $bashbrewArch == "riscv64" and env.version != "1.22" then
+							# https://go.dev/doc/go1.23#riscv
+							{ GORISCV64: "rva20u64" }
 						elif $bashbrewArch | startswith("arm64v") then
-							{ GOARCH: "arm64" } # TODO do something with arm64 variant
+							{ GOARCH: "arm64" }
+							+ if env.version != "1.22" then {
+								# https://go.dev/doc/go1.23#arm64
+								GOARM64: ($bashbrewArch | ltrimstr("arm64") | if index(".") then . else . + ".0" end),
+							} else {} end
 						elif $bashbrewArch | startswith("arm32v") then
 							{ GOARCH: "arm", GOARM: ($bashbrewArch | ltrimstr("arm32v")) }
 						else {} end