chore(ci): switch to determinatesystems installer

They have some MacOS fixes that are otherwise causing random
flakes.

.github/workflows/ci-backwards-compatibility.yml

@@ -37,12 +37,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Prepare
         uses: ./.github/actions/prepare
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint

.github/workflows/ci-fuzz.yml

@@ -35,12 +35,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Prepare
         uses: ./.github/actions/prepare
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint

.github/workflows/ci-nix.yml

@@ -45,12 +45,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint
@@ -99,13 +94,7 @@ jobs:
       - uses: actions/checkout@v4
         if: github.event_name != 'pull_request' || matrix.build-in-pr
 
-      - uses: cachix/install-nix-action@v30
-        if: github.event_name != 'pull_request' || matrix.build-in-pr
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         if: github.event_name != 'pull_request' || matrix.build-in-pr
         with:
@@ -149,13 +138,8 @@ jobs:
         if: github.event_name != 'pull_request' || matrix.build-in-pr
         uses: ./.github/actions/prepare
 
-      - uses: cachix/install-nix-action@v30
+      - uses: DeterminateSystems/nix-installer-action@v16
         if: github.event_name != 'pull_request' || matrix.build-in-pr
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
       - uses: cachix/cachix-action@v15
         if: github.event_name != 'pull_request' || matrix.build-in-pr
         with:
@@ -233,12 +217,7 @@ jobs:
     continue-on-error: true
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint
@@ -266,12 +245,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Prepare
         uses: ./.github/actions/prepare
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint
@@ -347,13 +321,8 @@ jobs:
       - uses: actions/checkout@v4
         if: github.event_name != 'pull_request' || matrix.build-in-pr
 
-      - uses: cachix/install-nix-action@v30
+      - uses: DeterminateSystems/nix-installer-action@v16
         if: github.event_name != 'pull_request' || matrix.build-in-pr
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
 
       - uses: cachix/cachix-action@v15
         if: github.event_name != 'pull_request' || matrix.build-in-pr
@@ -383,12 +352,7 @@ jobs:
       - name: Prepare
         uses: ./.github/actions/prepare
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint
@@ -507,12 +471,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint

.github/workflows/docs.yml

@@ -12,7 +12,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v30
+      - uses: DeterminateSystems/nix-installer-action@v16
+      - uses: cachix/cachix-action@v15
         with:
           name: fedimint
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

.github/workflows/hourly-run.yml

@@ -60,12 +60,7 @@ jobs:
 
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
 
       - uses: cachix/cachix-action@v15
         with:

.github/workflows/upgrade-tests.yml

@@ -44,12 +44,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Prepare
         uses: ./.github/actions/prepare
-      - uses: cachix/install-nix-action@v30
-        with:
-          nix_path: nixpkgs=channel:nixos-23.11
-          extra_nix_config: |
-            connect-timeout = 15
-            stalled-download-timeout = 15
+      - uses: DeterminateSystems/nix-installer-action@v16
       - uses: cachix/cachix-action@v15
         with:
           name: fedimint