workflow: use !cancelled() instead of always()

.github/workflows/build-machines-and-homes.yml

@@ -70,7 +70,8 @@ jobs:
           nix build -L "$package"
 
       - name: cache
-        # if: always()
+        # https://stackoverflow.com/a/58859404
+        if: '!cancelled()'
         run: |
           package=".#nixosConfigurations."${{ matrix.machine }}".config.system.build.toplevel"
           derivations=()
@@ -136,7 +137,8 @@ jobs:
           nix build -L "$package"
 
       - name: cache
-        # if: always()
+        # https://stackoverflow.com/a/58859404
+        if: '!cancelled()'
         run: |
           package=".#homeConfigurations."${{ matrix.home }}".activationPackage"
           derivations=()

.github/workflows/build-packages.yml

@@ -59,7 +59,8 @@ jobs:
       - run: nix build -L ${{ matrix.package }}
 
       - name: cache result
-        if: always()
+        # https://stackoverflow.com/a/58859404
+        if: '!cancelled()'
         run: |
           nix copy -j8 \
             --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem' \