Draft: aarch64 CI

This adds a job which builds the packages on aarch64.

ci/nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": null,
         "owner": "commercialhaskell",
         "repo": "all-cabal-hashes",
-        "rev": "b0a2944a580a29defa7e68ebc6298bf9d851d86a",
-        "sha256": "163m68dcqc0i13s631g18sx5phgabjcvkl0nvkmcgsaqd8fnbzfc",
+        "rev": "866124eac5b9a0c1d5c64d3f71fbf1c5e9216c4d",
+        "sha256": "1nihd03k95xc42xx6fmq7n2a06mhzk1nwk9xywhz3lj4rgy8613r",
         "type": "file",
-        "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/b0a2944a580a29defa7e68ebc6298bf9d851d86a.tar.gz",
+        "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/866124eac5b9a0c1d5c64d3f71fbf1c5e9216c4d.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "ghc-artefact-nix": {