chore(nix): add nix hash update automation

.github/workflows/nix-build.yml

@@ -0,0 +1,23 @@
+name: Build Nix package
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - go.mod
+      - go.sum
+
+jobs:
+  nix-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Build flake package
+        run: |
+          nix build .#pangolin-newt -L

.github/workflows/nix-dependabot-update-hash.yml

@@ -0,0 +1,48 @@
+name: Update Nix Package Hash On Dependabot PRs
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    branches:
+      - main
+
+jobs:
+  nix-update:
+    if: github.actor == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+
+      - name: Run nix-update
+        run: |
+          nix run nixpkgs#nix-update -- --flake pangolin-newt --no-src --version skip
+
+      - name: Check for changes
+        id: changes
+        run: |
+          if git diff --quiet; then
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Commit and push changes
+        if: steps.changes.outputs.changed == 'true'
+        run: |
+          git config user.name "dependabot[bot]"
+          git config user.email "dependabot[bot]@users.noreply.github.com"
+
+          git add .
+          git commit -m "chore(nix): fix hash for updated go dependencies"
+          git push

.gitignore

@@ -5,4 +5,6 @@ nohup.out
 *.iml
 certs/
 newt_arm64
-key
+key
+/.direnv/
+/result*

flake.nix

@@ -25,7 +25,7 @@
           inherit (pkgs) lib;
 
           # Update version when releasing
-          version = "1.7.0";
+          version = "1.8.0";
         in
         {
           default = self.packages.${system}.pangolin-newt;
@@ -37,21 +37,34 @@
 
             vendorHash = "sha256-5Xr6mwPtsqEliKeKv2rhhp6JC7u3coP4nnhIxGMqccU=";
 
+            nativeInstallCheckInputs = [ pkgs.versionCheckHook ];
+
             env = {
               CGO_ENABLED = 0;
             };
 
             ldflags = [
+              "-s"
+              "-w"
               "-X main.newtVersion=${version}"
             ];
 
+            # Tests are broken due to a lack of Internet.
+            # Disable running `go test`, and instead do
+            # a simple version check instead.
+            doCheck = false;
+            doInstallCheck = true;
+
+            versionCheckProgramArg = [ "-version" ];
+
             meta = {
               description = "A tunneling client for Pangolin";
               homepage = "https://github.com/fosrl/newt";
               license = lib.licenses.gpl3;
               maintainers = [
                 lib.maintainers.water-sucks
               ];
+              mainProgram = "newt";
             };
           };
         }