ci: Use cachix authtoken in CI (#1821)

.circleci/config.yml

@@ -140,9 +140,16 @@ jobs:
           command: |
             # Only push to the cache when CircleCI makes the CACHIX_SIGNING_KEY
             # available (e.g. not for pull requests).
-            if [ -n "${CACHIX_SIGNING_KEY:-""}" ]; then
+            if [ -n "${CACHIX_AUTH_TOKEN:-""}" ]; then
               echo "Building and caching all derivations..."
+              cachix authtoken "$CACHIX_AUTH_TOKEN"
+
+              # Push new builds as we go
               nix-build | cachix push postgrest
+
+              # Make sure that everything, including .drv files, is pushed
+              nix-env -f default.nix -iA devtools
+              postgrest-push-cachix
             else
               echo "Building all derivations (caching skipped for outside pull requests)..."
               nix-build

nix/devtools.nix

@@ -39,13 +39,16 @@ let
         docs = ''
           Push all build artifacts to cachix.
 
-          Requires that the CACHIX_SIGNING_KEY for postgrest is set as an
+          Requires authentication with `cachix authtoken ...`.
-          environment variable.
         '';
         inRootDir = true;
       }
       ''
-        nix-store -qR --include-outputs "$(nix-instantiate)" | cachix push postgrest
+        nix-instantiate \
+          | while read -r drv; do
+              nix-store -qR --include-outputs "$drv"
+            done \
+          | cachix push postgrest
       '';
 
   build =