try fixing gitea ci: v10

.github/workflows/diff-pr.yml

@@ -19,11 +19,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - name: worktree base for diff
         run: git worktree add "$RUNNER_TEMP/base" "${{ github.event.pull_request.base.sha }}"
 

.github/workflows/diff-tag.yml

@@ -15,11 +15,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - name: diff latest tag against HEAD
         run: |
           tag=$(git tag --sort=-creatordate | head -n1)

.github/workflows/flake-check.yml

@@ -18,9 +18,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - run: nix flake check -L

.github/workflows/flake-update.yml

@@ -15,11 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - run: nix flake update
 
       - name: open/update PR

.github/workflows/lint.yml

@@ -19,11 +19,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - name: pick reporter
         run: |
           if [ "${{ github.event_name }}" = pull_request ]; then

.github/workflows/vulnix.yml

@@ -15,11 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
-
       - name: scan host closures
         id: scan
         run: echo "count=$(nix run .#ci -- vulnix . "$RUNNER_TEMP/issue.md")" >> "$GITHUB_OUTPUT"