Add cow-files app for static file hosting

.github/workflows/cow-files.yml

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+name: 'Deploy: files.cow.fi'
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'static-files/public/**'
+  pull_request:
+    paths:
+      - 'static-files/public/**'
+  workflow_dispatch: # Manual trigger
+
+# Required for authenticating with AWS IAM
+permissions:
+  id-token: write
+  contents: read
+
+env:
+  NODE_VERSION: lts/gallium
+
+jobs:
+  deploy:
+    name: Deploy to files.cow.fi
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v2
+        with:
+          role-to-assume: arn:aws:iam::693696263829:role/cow-files-github-action-role
+          role-session-name: githubactionsession
+          aws-region: eu-central-1
+
+      - name: Upload to S3
+        run: |
+          aws s3 sync static-files/public/ s3://files.cow.fi/cow-files/ \
+            --delete \
+            --exclude ".DS_Store" \
+            --exclude "*.tmp" \
+            --exclude "*.temp"
+
+      - name: Invalidate CloudFront cache
+        run: |
+          aws cloudfront create-invalidation \
+            --distribution-id ${{ secrets.CLOUDFRONT_DISTRIBUTION_ID }} \
+            --paths "/cow-files/*"

static-files/README.md

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+# CoW Files
+
+This application serves as a static file hosting repository for files that are automatically uploaded to files.cow.fi via GitHub workflows.
+
+## Usage
+
+1. Place any files that need to be hosted on `files.cow.fi` in the `public/` directory
+2. Files will be automatically uploaded to `files.cow.fi` through GitHub workflows
+3. The directory structure in `public/` will be preserved in the final URL path
+
+For example:
+
+- A file `public/example.json` will be available at `https://files.cow.fi/cow-files/example.json`
+- A file `public/docs/guide.pdf` will be available at `https://files.cow.fi/cow-files/docs/guide.pdf`
+
+## File Organization Guidelines
+
+- Keep files organized in meaningful subdirectories
+- Use lowercase names for files and directories
+- Use hyphens (-) instead of spaces in filenames
+- Include version numbers in filenames when applicable
+
+## Automatic Deployment
+
+Files are automatically deployed to `files.cow.fi` through GitHub workflows. The workflow configuration can be found in the repository's `.github/workflows` directory.

static-files/public/test.txt

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+hello world 2