Remove UPDATE_ROUTES_GUIDE.md, update .env.example, and add Docker image build workflow

- Deleted `UPDATE_ROUTES_GUIDE.md` as it is no longer necessary.
- Updated `.env.example` with a default `GOOGLE_REDIRECT_URI` placeholder.
- Introduced a GitHub Actions workflow for building and pushing the base Docker image.
- Added `Base.Dockerfile` with Liberica OpenJRE and Pandoc for future use cases.

Author: IRus

.env.example

@@ -2,6 +2,7 @@
 # Get these from https://console.developers.google.com/
 GOOGLE_CLIENT_ID=your_google_client_id_here
 GOOGLE_CLIENT_SECRET=your_google_client_secret_here
+GOOGLE_REDIRECT_URI=http://localhost:8080/callback
 
 # Session sign and encrypt keys
 # Keys will be generated by the app, if none provided
@@ -16,7 +17,7 @@ KOTBUSTA_POSTGRES_PASSWORD=kotbusta
 KOTBUSTA_POSTGRES_DATABASE=kotbusta
 
 # Books data path (required - path to your flibusta data)
-# BOOKS_DATA_PATH=/path/to/your/flibusta/books
+BOOKS_DATA_PATH=/path/to/your/flibusta/books
 
 # Admin email address used for granting administrative privileges
-# ADMIN_EMAIL=your_admin_email_here
+ADMIN_EMAIL=your_admin_email_here

.github/workflows/build-base-image.yml

@@ -0,0 +1,52 @@
+name: Build Base Docker Image
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Docker image tag"
+        required: true
+        default: "latest"
+        type: string
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}-base
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=${{ inputs.tag }}
+            type=raw,value={{date 'YYYYMMDD'}}-${{ inputs.tag }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Base.Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Base.Dockerfile

@@ -0,0 +1,24 @@
+# Base image with Liberica OpenJRE and Pandoc
+FROM bellsoft/liberica-openjre-debian:24.0.2
+
+# Install pandoc
+RUN apt-get update && \
+    apt-get install -y pandoc && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create application user for security
+RUN useradd --create-home --shell /bin/bash kotbusta
+
+# Create app and data directories with proper permissions
+RUN mkdir -p /app/data && \
+    chown -R kotbusta:kotbusta /app
+
+# Switch to non-root user
+USER kotbusta
+
+# Set working directory
+WORKDIR /app
+
+# Expose port (for documentation purposes)
+EXPOSE 8080