feat(build): GitLab CI component, GitHub Actions action, and pre-commit hook

templates/check.yml — GitLab CI/CD Catalog component; downloads the glint
Linux binary and runs glint check; inputs: stage, pipeline_file, version,
allow_failure, extra_args.

action.yml — GitHub Actions composite action; downloads glint into
$RUNNER_TEMP and runs glint check; inputs: version, file, args. Mirror
to github.com/k3nny/glint to use as `uses: k3nny/glint@vX.Y.Z`.

.pre-commit-hooks.yaml — language: golang hook; pre-commit builds glint
from source on first run and re-runs on staged .gitlab-ci.yml changes.
Reference as repo: https://git.k3nny.fr/k3nny/glint.

README updated with an Integrations section covering all three.
Git remote corrected to https://git.k3nny.fr/k3nny/glint.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

action.yml

@@ -0,0 +1,62 @@
+# GitHub Actions composite action — glint pipeline validator
+#
+# To use this action, mirror this repository to GitHub as k3nny/glint, then:
+#
+#   - uses: k3nny/glint@v0.2.28
+#     with:
+#       file: .gitlab-ci.yml   # optional
+#
+# Alternatively, copy this file into your own repository and reference it
+# as a local action:
+#
+#   - uses: ./.github/actions/glint
+
+name: 'glint'
+description: 'Validate a GitLab CI pipeline file with glint'
+author: 'k3nny'
+
+branding:
+  icon: 'check-circle'
+  color: 'orange'
+
+inputs:
+  version:
+    description: >-
+      glint release tag to install (e.g. 'v0.2.28'). Defaults to 'latest'
+      which resolves to the newest published release.
+    required: false
+    default: 'latest'
+  file:
+    description: 'Path to the pipeline file to validate.'
+    required: false
+    default: '.gitlab-ci.yml'
+  args:
+    description: 'Additional arguments passed to glint check (e.g. --format sarif).'
+    required: false
+    default: ''
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Install glint
+      shell: bash
+      env:
+        GLINT_VERSION: ${{ inputs.version }}
+      run: |
+        set -euo pipefail
+        if [ "$GLINT_VERSION" = "latest" ]; then
+          GLINT_VERSION=$(curl -sf \
+            "https://git.k3nny.fr/api/v1/repos/k3nny/glint/releases?limit=1" \
+            | grep '"tag_name"' | head -1 | cut -d'"' -f4)
+        fi
+        DEST="$RUNNER_TEMP/glint-bin"
+        mkdir -p "$DEST"
+        URL="https://git.k3nny.fr/k3nny/glint/releases/download/${GLINT_VERSION}/glint-${GLINT_VERSION}-linux-amd64"
+        curl -sfL "$URL" -o "$DEST/glint"
+        chmod +x "$DEST/glint"
+        echo "$DEST" >> "$GITHUB_PATH"
+        "$DEST/glint" --version
+
+    - name: Run glint check
+      shell: bash
+      run: glint check ${{ inputs.args }} "${{ inputs.file }}"