Add PodFetch template (#1035)

* Add PodFetch template

* Use env array syntax in template.toml

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Address review: match version to image tag, expose admin_username variable, dark-mode friendly logo

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

blueprints/podfetch/docker-compose.yml

@@ -0,0 +1,19 @@
+version: "3.8"
+services:
+  podfetch:
+    image: samuel19982/podfetch:v5.2.2
+    restart: unless-stopped
+    environment:
+      - DATABASE_URL=sqlite:///app/db/podcast.db
+      - POLLING_INTERVAL=300
+      - BASIC_AUTH=true
+      - USERNAME=${USERNAME}
+      - PASSWORD=${PASSWORD}
+      - GPODDER_INTEGRATION_ENABLED=true
+    volumes:
+      - podfetch-podcasts:/app/podcasts
+      - podfetch-db:/app/db
+
+volumes:
+  podfetch-podcasts: {}
+  podfetch-db: {}