Skip build and push when flake.lock has no changes

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/c6ed3eab64d23520bcbb858aa53fe2b533725d4a?narHash=sha256-WxAEkAbo8dP7qiyPM6VN4ZGAxfuBVlNBNPkrqkrXVEc%3D' (2026-02-21)
  → 'github:nix-community/home-manager/5bd3589390b431a63072868a90c0f24771ff4cbb?narHash=sha256-Tl2I0YXdhSTufGqAaD1ySh8x%2BcvVsEI1mJyJg12lxhI%3D' (2026-02-22)
• Updated input 'microvm':
    'github:astro/microvm.nix/789c90b164b55b4379e7a94af8b9c01489024c18?narHash=sha256-1XJOslVyF7yzf6yd/yl1VjGLywsbtwmQh3X1LuJcLI4%3D' (2026-02-17)
  → 'github:astro/microvm.nix/a3abc020a3d8e624e145f4144ed40702f788ea32?narHash=sha256-Pf4CaRoOLQV02m2POPA%2B0EWvb3gVdpaiS0hNNVZhO3c%3D' (2026-02-21)
• Updated input 'nix-index-database':
    'github:Mic92/nix-index-database/efec7aaad8d43f8e5194df46a007456093c40f88?narHash=sha256-UIKOwG0D9XVIJfNWg6%2BgENAvQP%2B7LO46eO0Jpe%2BItJ0%3D' (2026-02-15)
  → 'github:Mic92/nix-index-database/8f590b832326ab9699444f3a48240595954a4b10?narHash=sha256-/phvMgr1yutyAMjKnZlxkVplzxHiz60i4rc%2BgKzpwhg%3D' (2026-02-22)

.gitea/workflows/auto-update.yaml

@@ -20,23 +20,41 @@ jobs:
         with:
           fetch-depth: 0
           ref: master
+          token: ${{ secrets.PUSH_TOKEN }}
+
+      - name: Configure git identity
+        run: |
+          git config user.name "gitea-runner"
+          git config user.email "gitea-runner@neet.dev"
 
       - name: Update flake inputs
-        run: nix flake update --commit-lock-file
+        id: update
+        run: |
+          nix flake update
+          if git diff --quiet flake.lock; then
+            echo "No changes to flake.lock, nothing to do"
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            git add flake.lock
+            git commit -m "flake.lock: update inputs"
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
 
       - name: Build and cache
+        if: steps.update.outputs.changed == 'true'
         run: bash .gitea/scripts/build-and-cache.sh
 
       - name: Push updated lockfile
+        if: steps.update.outputs.changed == 'true'
         run: git push
 
       - name: Notify on failure
-        if: failure()
+        if: failure() && steps.update.outputs.changed == 'true'
         run: |
           curl -s \
             -H "Authorization: Bearer ${{ secrets.NTFY_TOKEN }}" \
             -H "Title: Flake auto-update failed" \
             -H "Priority: high" \
             -H "Tags: warning" \
-            -d "Auto-update workflow failed. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_id }}" \
-            ntfy.neet.dev/nix-flake-updates
+            -d "Auto-update workflow failed. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_number }}" \
+            https://ntfy.neet.dev/nix-flake-updates

.gitea/workflows/check-flake.yaml

@@ -20,3 +20,14 @@ jobs:
 
       - name: Build and cache
         run: bash .gitea/scripts/build-and-cache.sh
+
+      - name: Notify on failure
+        if: failure()
+        run: |
+          curl -s \
+            -H "Authorization: Bearer ${{ secrets.NTFY_TOKEN }}" \
+            -H "Title: Flake check failed" \
+            -H "Priority: high" \
+            -H "Tags: warning" \
+            -d "Check failed for ${{ gitea.ref_name }}. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_number }}" \
+            https://ntfy.neet.dev/nix-flake-updates

flake.lock

@@ -228,11 +228,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1771683283,
-        "narHash": "sha256-WxAEkAbo8dP7qiyPM6VN4ZGAxfuBVlNBNPkrqkrXVEc=",
+        "lastModified": 1771756436,
+        "narHash": "sha256-Tl2I0YXdhSTufGqAaD1ySh8x+cvVsEI1mJyJg12lxhI=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "c6ed3eab64d23520bcbb858aa53fe2b533725d4a",
+        "rev": "5bd3589390b431a63072868a90c0f24771ff4cbb",
         "type": "github"
       },
       "original": {
@@ -250,11 +250,11 @@
         "spectrum": "spectrum"
       },
       "locked": {
-        "lastModified": 1771365290,
-        "narHash": "sha256-1XJOslVyF7yzf6yd/yl1VjGLywsbtwmQh3X1LuJcLI4=",
+        "lastModified": 1771712688,
+        "narHash": "sha256-Pf4CaRoOLQV02m2POPA+0EWvb3gVdpaiS0hNNVZhO3c=",
         "owner": "astro",
         "repo": "microvm.nix",
-        "rev": "789c90b164b55b4379e7a94af8b9c01489024c18",
+        "rev": "a3abc020a3d8e624e145f4144ed40702f788ea32",
         "type": "github"
       },
       "original": {
@@ -270,11 +270,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1771130777,
-        "narHash": "sha256-UIKOwG0D9XVIJfNWg6+gENAvQP+7LO46eO0Jpe+ItJ0=",
+        "lastModified": 1771734689,
+        "narHash": "sha256-/phvMgr1yutyAMjKnZlxkVplzxHiz60i4rc+gKzpwhg=",
         "owner": "Mic92",
         "repo": "nix-index-database",
-        "rev": "efec7aaad8d43f8e5194df46a007456093c40f88",
+        "rev": "8f590b832326ab9699444f3a48240595954a4b10",
         "type": "github"
       },
       "original": {