Revert "add build cache action"

This reverts commit d53981c94b.

.github/workflows/flake-health-checks.yml

@@ -15,16 +15,6 @@ jobs:
         os: [ubuntu-latest]
     steps:
       - uses: DeterminateSystems/nix-installer-action@main
-
-      - name: Restore Nix store
-        id: restore
-        uses: nix-community/cache-nix-action@v6
-        with:
-          # save a new cache every time `ci.yaml` changes
-          primary-key: similar-cache-${{ matrix.os }}-individual-${{ hashFiles('flake.lock', '*.nix') }}
-          # otherwise, restore a common cache if and only if it matches the current `ci.yaml`
-          restore-prefixes-first-match: similar-cache-${{ matrix.os }}-common-
-
       - name: Setup Attic cache
         uses: ryanccn/attic-action@v0
         with:
@@ -32,13 +22,9 @@ jobs:
           cache: ${{ secrets.ATTIC_CACHE }}
           token: ${{ secrets.ATTIC_TOKEN }}
           skip-push: "true"
-
       - uses: actions/checkout@v4
-
       - run: nix flake check --accept-flake-config
-
       - run: nix ./utils/attic-push.bash
-
   build-checks:
     name: "Build nix outputs"
     runs-on: ${{ matrix.os }}
@@ -47,16 +33,6 @@ jobs:
         os: [ubuntu-latest]
     steps:
       - uses: DeterminateSystems/nix-installer-action@main
-
-      - name: Restore Nix store
-        id: restore
-        uses: nix-community/cache-nix-action@v6
-        with:
-          # save a new cache every time `ci.yaml` changes
-          primary-key: similar-cache-${{ matrix.os }}-individual-${{ hashFiles('flake.lock', '*.nix') }}
-          # otherwise, restore a common cache if and only if it matches the current `ci.yaml`
-          restore-prefixes-first-match: similar-cache-${{ matrix.os }}-common-
-
       - name: Setup Attic cache
         uses: ryanccn/attic-action@v0
         with:
@@ -64,27 +40,9 @@ jobs:
           cache: ${{ secrets.ATTIC_CACHE }}
           token: ${{ secrets.ATTIC_TOKEN }}
           skip-push: "true"
-
       - uses: actions/checkout@v4
-
       - name: Build all outputs
         run: nix run git+https://nayeonie.com/ahuston-0/flake-update-diff -- --build .
-
       - name: Push to Attic
         run: nix ./utils/attic-push.bash
         continue-on-error: true
-
-      - name: Save Nix store
-        if: steps.restore.outputs.hit == 'false'
-        uses: nix-community/cache-nix-action@v6
-        with:
-          # save a new cache every time `ci.yaml` changes
-          primary-key: similar-cache-${{ matrix.os }}-individual-${{ hashFiles('flake.lock', '*.nix') }}
-          # do purge caches
-          purge: true
-          # purge all versions of the individual cache
-          purge-prefixes: similar-cache-${{ matrix.os }}-individual-
-          # created more than 0 seconds ago relative to the start of the `Post Restore` phase
-          purge-created: 0
-          # except the version with the `primary-key`, if it exists
-          purge-primary-key: never