👷 ci(build): always post build gate on pull requests

The build workflows filtered at the pull_request path level, so a PR
that left the package source untouched never ran them and their required
gate (build / ✅ <pkg>-build) never posted, leaving the PR blocked on a
check that could not arrive.

Trigger the build workflows on every pull request and move the path
check into an internal changes job, passing the result to the reusable
build as a run input. When it is false the bump job is skipped and the
matrix jobs skip with it, while the always-run aggregate job still posts
a green gate. Push and release paths keep their existing filters and run
the full build.

Author: gaborbernat

.github/workflows/_build.yaml

@@ -9,6 +9,11 @@ on:
         required: true
         type: string
         description: "Pre-commit mirror repo (e.g. tox-dev/pyproject-fmt)"
+      run:
+        required: false
+        type: string
+        default: "true"
+        description: "When 'false', skip the build jobs but still post the aggregate gate"
     outputs:
       version:
         value: ${{ jobs.bump.outputs.version }}
@@ -25,6 +30,7 @@ env:
 jobs:
   bump:
     name: 🔖 bump
+    if: ${{ inputs.run == 'true' }}
     runs-on: ubuntu-24.04
     permissions:
       pull-requests: read

.github/workflows/pyproject_fmt_build.yaml

@@ -17,12 +17,6 @@ on:
       - ".github/workflows/pyproject_fmt_build.yaml"
       - ".github/workflows/_build.yaml"
   pull_request:
-    paths:
-      - "common/**"
-      - "toml-fmt-common/**"
-      - "pyproject-fmt/**"
-      - ".github/workflows/pyproject_fmt_build.yaml"
-      - ".github/workflows/_build.yaml"
   schedule:
     - cron: "0 8 * * *"
 
@@ -31,11 +25,37 @@ concurrency:
   cancel-in-progress: ${{ github.event.inputs.release == 'no' || github.event.inputs.release == null }}
 
 jobs:
+  changes:
+    name: 🔍 changes
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      run: ${{ github.event_name != 'pull_request' || steps.filter.outputs.run == 'true' }}
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - name: 🔍 Check for changes
+        uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
+        id: filter
+        with:
+          filters: |
+            run:
+              - 'common/**'
+              - 'toml-fmt-common/**'
+              - 'pyproject-fmt/**'
+              - '.github/workflows/pyproject_fmt_build.yaml'
+              - '.github/workflows/_build.yaml'
+
   build:
+    needs: changes
     uses: ./.github/workflows/_build.yaml
     with:
       package-name: pyproject-fmt
       pre-commit-mirror: tox-dev/pyproject-fmt
+      run: ${{ needs.changes.outputs.run }}
     secrets: inherit # zizmor: ignore[secrets-inherit]
     permissions:
       contents: write

.github/workflows/tox_toml_fmt_build.yaml

@@ -17,12 +17,6 @@ on:
       - ".github/workflows/tox_toml_fmt_build.yaml"
       - ".github/workflows/_build.yaml"
   pull_request:
-    paths:
-      - "common/**"
-      - "toml-fmt-common/**"
-      - "tox-toml-fmt/**"
-      - ".github/workflows/tox_toml_fmt_build.yaml"
-      - ".github/workflows/_build.yaml"
   schedule:
     - cron: "0 8 * * *"
 
@@ -31,11 +25,37 @@ concurrency:
   cancel-in-progress: ${{ github.event.inputs.release == 'no' || github.event.inputs.release == null }}
 
 jobs:
+  changes:
+    name: 🔍 changes
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      run: ${{ github.event_name != 'pull_request' || steps.filter.outputs.run == 'true' }}
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - name: 🔍 Check for changes
+        uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
+        id: filter
+        with:
+          filters: |
+            run:
+              - 'common/**'
+              - 'toml-fmt-common/**'
+              - 'tox-toml-fmt/**'
+              - '.github/workflows/tox_toml_fmt_build.yaml'
+              - '.github/workflows/_build.yaml'
+
   build:
+    needs: changes
     uses: ./.github/workflows/_build.yaml
     with:
       package-name: tox-toml-fmt
       pre-commit-mirror: tox-dev/tox-toml-fmt
+      run: ${{ needs.changes.outputs.run }}
     secrets: inherit # zizmor: ignore[secrets-inherit]
     permissions:
       contents: write