Use GitHub Actions instead of Netlify (#2462)

Signed-off-by: Daniel Gray <dngray@privacyguides.org>

.github/workflows/publish-mirror.yml

@@ -0,0 +1,61 @@
+# Copyright (c) 2022 Jonah Aragon <jonah@triplebit.net>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+name: 🪞 Push to Mirrors
+
+on: [ push, delete, create ]
+
+# Ensures that only one mirror task will run at a time.
+concurrency:
+  group: git-mirror
+
+jobs:
+  gitlab:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mirror to GitLab
+        uses: wearerequired/git-mirror-action@v1
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.ACTIONS_SSH_KEY }}
+        with:
+          source-repo: "git@github.com:privacyguides/privacyguides.org.git"
+          destination-repo: "git@gitlab.com:privacyguides/privacyguides.org.git"
+
+  codeberg:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mirror to Codeberg
+        uses: wearerequired/git-mirror-action@v1
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.ACTIONS_SSH_KEY }}
+        with:
+          source-repo: "git@github.com:privacyguides/privacyguides.org.git"
+          destination-repo: "git@codeberg.org:privacyguides/privacyguides.org.git"
+
+  sourcehut:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mirror to SourceHut
+        uses: wearerequired/git-mirror-action@v1
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.ACTIONS_SSH_KEY }}
+        with:
+          source-repo: "git@github.com:privacyguides/privacyguides.org.git"
+          destination-repo: "git@git.sr.ht:~jonaharagon/privacyguides.org"