Move workflows to .github/workflows

.github/workflows/compress-images.yml

@@ -1 +0,0 @@
-../../workflows/compress-images.yml

.github/workflows/compress-images.yml

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+# Compress images on demand (workflow_dispatch), and at 11pm every Sunday (schedule).
+# Open a Pull Request if any images can be compressed.
+name: Compress Images on Demand
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '00 23 * * 0'
+jobs:
+  build:
+    name: calibreapp/image-actions
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Compress Images
+        id: calibre
+        uses: calibreapp/image-actions@main
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          compressOnly: true
+      - name: Create New Pull Request If Needed
+        if: steps.calibre.outputs.markdown != ''
+        uses: peter-evans/create-pull-request@v3
+        with:
+          title: Compressed Images Nightly
+          branch-suffix: timestamp
+          commit-message: Compressed Images
+          body: ${{ steps.calibre.outputs.markdown }}