Update build process ci and docs

packages/cache/default.nix

@@ -1,42 +0,0 @@
-{
-  attic-client,
-  findutils,
-  gnugrep,
-  writeShellApplication,
-  ...
-}:
-writeShellApplication {
-  name = "cache";
-  meta.description = "Access the infrastructure's attic cache. Mostly used in CI.";
-  runtimeInputs = [
-    attic-client
-    findutils
-    gnugrep
-  ];
-  text = ''
-    SERVER="https://attic.qo.is/"
-    CACHE_NAME="qois"
-    CACHE_REPO="$CACHE_NAME:qois-infrastructure"
-    if [ -z "$ATTIC_AUTH_TOKEN" ]; then
-      echo "Please set the \$ATTIC_AUTH_TOKEN environment variable to access the cache."
-      exit 3
-    fi
-    attic login "$CACHE_NAME" "$SERVER" "$ATTIC_AUTH_TOKEN"
-
-    case "$1" in
-      use)
-        attic use "$CACHE_REPO"
-      ;;
-      watch)
-        attic watch-store "$CACHE_REPO"
-      ;;
-      push)
-        RESULT_PATH="./result"
-        # Add build dependencies as well
-        nix-store -qR --include-outputs "$(nix-store -qd $RESULT_PATH)"   | grep -v '\.drv$' \
-          | xargs attic push "$CACHE_REPO" "$RESULT_PATH"
-      ;;
-
-    esac
-  '';
-}