Breakout the GitHub Actions workflow in run-gen-index.yml to three ne…

…w files

The three new actions are:
1. extract-images.yml: Extract new images to be used as thumnails in the gallery, when new editions of the "filosoof" get added to the pdf directory (pdfs beginning with a number). Extract these images from the coverpages of the PDF.
2. regenerate-index.yml: Regenerate `index.html` when `template.html` gets alltered.
3. regenerate-gallery.yml: Regenerate the "galllery" that gets inserted into `index.html` when a .png file beginning with a number gets added (by another action) to the /img directory.

These workflows should make updating the "filosoof" website basically automatic.

.github/workflows/extract-images.yml

@@ -0,0 +1,35 @@
+# Extract the coverpages from the pdfs in ./pdf, as images, save then in ./img, so that we can use them as thumbnails in the gallery in 'index.html'.
+name: extract_coverpages
+
+on:
+  push:
+    paths:
+      - 'pdf/[0-9]*.pdf'
+
+jobs:
+    extract-coverpages:
+        runs-on: ubuntu-latest
+        steps:
+        - name: Checkout project
+            uses: actions/checkout@v4
+        - name: Set up Python
+            uses: actions/setup-python@v4
+            with:
+            python-version: '3.x'
+        - name: Install dependencies
+            run: |
+            echo "Installing and upgrading pip..."
+            python -m pip install --upgrade pip
+            echo "Installing pdf2image..."
+            pip install pdf2image # For extracting coverpages
+
+        - name: Extract coverpages run python script
+            run: python3 extract-humbnails.py
+
+        - name: Commit and push changes
+            run: |
+            git config --local user.email "
+            git config --local user.name "GitHub Action"
+            git add img
+            git commit -m "[CI/CD] Extract coverpages"
+            git push

.github/workflows/regenerate-gallery.yml

@@ -0,0 +1,30 @@
+# Deze file zou de `index.html` aan moeten passen, als de nieuwe thumbnails geextraheerd zijn.
+
+on:
+  push:
+    paths:
+      - 'img/[0-9]*.png'
+
+jobs:
+    add-new-thumbnails-to-gallery:
+        runs-on: ubuntu-latest
+        steps:
+        - name: Checkout project
+            uses: actions/checkout@v4
+        - name: Set up Python
+            uses: actions/setup-python@v4
+            with:
+            python-version: '3.x'
+
+        - name: Update index.html with new images.
+        run: |
+            echo "Updating index.html with new images."
+            python3 generate-index.py
+            
+        - name: Commit changes
+        run: |
+            git config --local user.email "
+            git config --local user.name "GitHub Action"
+            git add index.html
+            git commit -m "[CI/CD] Update index.html with new images"
+            git push

.github/workflows/regnerate-index.yml

@@ -0,0 +1,31 @@
+# Deze action zou moeten draaien als de template.html wordt aangepast, zodat de nieuwe info er komt te staan.
+name: Update from 'template.html'
+
+on:
+  push:
+    paths:
+      - 'template.html'
+
+jobs:
+    update-index-html-from-template-html:
+        runs-on: ubuntu-latest
+        steps:
+        - name: Checkout project
+            uses: actions/checkout@v4
+        - name: Set up Python
+            uses: actions/setup-python@v4
+            with:
+            python-version: '3.x'
+
+        - name: Update index.html from new template.html
+        run: |
+            echo "Updating index.html from new template.html"
+            python3 generate-index.py
+            
+        - name: Commit changes
+        run: |
+            git config --local user.email "
+            git config --local user.name "GitHub Action"
+            git add index.html
+            git commit -m "[CI/CD] Update index.html from new template.html"
+            git push