feat: Improve build pipeline (#78)

This pull request enhances the `.github/workflows/update-flake.yaml`
file by adding new features and improving the build and validation
process. The key changes include allowing manual triggering, adding a
matrix strategy to run jobs on multiple operating systems, and
implementing steps to handle build and check failures by creating issues
automatically.

Enhancements to build and validation process:

*
[`.github/workflows/update-flake.yaml`](diffhunk://#diff-4a139fc25db101424a99bb7668e55ce5a6a6f32aa9a3ed5838b638a3d14e4a4cR1-R68):
Added `workflow_dispatch` to allow manual triggering of the workflow.
*
[`.github/workflows/update-flake.yaml`](diffhunk://#diff-4a139fc25db101424a99bb7668e55ce5a6a6f32aa9a3ed5838b638a3d14e4a4cR1-R68):
Introduced a matrix strategy to run jobs on both `ubuntu-latest` and
`macos-latest`, and included `fail-fast: false` to continue with other
jobs even if one fails.
*
[`.github/workflows/update-flake.yaml`](diffhunk://#diff-4a139fc25db101424a99bb7668e55ce5a6a6f32aa9a3ed5838b638a3d14e4a4cR1-R68):
Added a step to build and test the configuration, capturing the output
and setting the build status in the environment variables.
*
[`.github/workflows/update-flake.yaml`](diffhunk://#diff-4a139fc25db101424a99bb7668e55ce5a6a6f32aa9a3ed5838b638a3d14e4a4cR1-R68):
Implemented a step to create an issue on build failure, using
`actions/github-script@v7` to post the build output in the issue
description.
*
[`.github/workflows/update-flake.yaml`](diffhunk://#diff-4a139fc25db101424a99bb7668e55ce5a6a6f32aa9a3ed5838b638a3d14e4a4cR77-R120):
Added steps to run checks and create an issue on check failure, similar
to the build failure handling.

.github/workflows/update-flake.yaml

@@ -1,18 +1,71 @@
+name: Update Flake and Validate Build
+
 on:
   schedule:
     - cron: "30 00 * * 1"
+  workflow_dispatch: # Allow manual triggering
 
 jobs:
-  lockfile:
+  build-and-update:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+      fail-fast: false # Continue with other jobs even if one fails
+    
+    runs-on: ${{ matrix.os }}
+    
     steps:
       - name: Repository Checkout
         uses: actions/checkout@v4
 
-      - name: Instal Nix
+      - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@v16
 
+      - name: Build and Test Configuration
+        id: build
+        continue-on-error: true # Continue to next steps even if build fails
+        run: |
+          # Run the build and capture output
+          OUTPUT=$(nix build .# 2>&1)
+          echo "build_output<<EOF" >> $GITHUB_ENV
+          echo "$OUTPUT" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+          
+          # Check if build succeeded
+          if [ $? -eq 0 ]; then
+            echo "build_status=success" >> $GITHUB_ENV
+          else
+            echo "build_status=failure" >> $GITHUB_ENV
+          fi
+
+      - name: Create Issue on Build Failure
+        if: env.build_status == 'failure'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const os = '${{ matrix.os }}';
+            const buildOutput = process.env.build_output;
+            
+            await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.name,
+              title: `🔨 Build Failed on ${os}`,
+              body: `Build failed during automated validation on ${os}.
+              
+              <details>
+              <summary>Build Output</summary>
+              
+              \`\`\`
+              ${buildOutput}
+              \`\`\`
+              </details>
+              
+              Please review the build output and fix any issues.`,
+              labels: ['build-failure', 'bug']
+            });
+
       - name: Update flake.lock
+        if: matrix.os == 'ubuntu-latest' && env.build_status == 'success'
         uses: DeterminateSystems/update-flake-lock@v24
         with:
           nix-options: --debug --log-format raw
@@ -21,3 +74,47 @@ jobs:
           pr-labels: |
             dependencies
             automated
+
+      - name: Run Checks
+        id: checks
+        if: env.build_status == 'success'
+        continue-on-error: true
+        run: |
+          # Run the checks and capture output
+          OUTPUT=$(nix flake check 2>&1)
+          echo "check_output<<EOF" >> $GITHUB_ENV
+          echo "$OUTPUT" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+          
+          # Check if checks succeeded
+          if [ $? -eq 0 ]; then
+            echo "check_status=success" >> $GITHUB_ENV
+          else
+            echo "check_status=failure" >> $GITHUB_ENV
+          fi
+
+      - name: Create Issue on Check Failure
+        if: env.check_status == 'failure'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const os = '${{ matrix.os }}';
+            const checkOutput = process.env.check_output;
+            
+            await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.name,
+              title: `⚠️ Checks Failed on ${os}`,
+              body: `Checks failed during automated validation on ${os}.
+              
+              <details>
+              <summary>Check Output</summary>
+              
+              \`\`\`
+              ${checkOutput}
+              \`\`\`
+              </details>
+              
+              Please review the check output and fix any issues.`,
+              labels: ['check-failure', 'bug']
+            });