Add reusable workflows

Signed-off-by: Steffen Vogel <[email protected]>

.github/workflows/mirror.yaml

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+# SPDX-FileCopyrightText: 2023-2024 Steffen Vogel <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+# yaml-language-server: $schema=https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/github-workflow.json
+---
+name: Mirror to Codeberg
+
+on:
+  workflow_call:
+    secrets:
+      CODEBERG_SSH_KEY:
+        required: true
+
+jobs:
+  mirror:
+    name: Mirror
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - uses: yesolutions/mirror-action@master
+      with:
+        REMOTE: [email protected]:${{ github.repository }}.git
+        GIT_SSH_PRIVATE_KEY: ${{ secrets.CODEBERG_SSH_KEY }}
+        GIT_SSH_NO_VERIFY_HOST: "true"
+

.github/workflows/reuse.yaml

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+# SPDX-FileCopyrightText: 2022 Free Software Foundation Europe e.V. <https://fsfe.org>
+# SPDX-License-Identifier: CC0-1.0
+
+# yaml-language-server: $schema=https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/github-workflow.json
+---
+name: Compliance Checks
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    name: REUSE
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: REUSE Compliance Check
+      uses: fsfe/reuse-action@v3