feat: Add CI testing infrastructure with act_runner support

- Created scripts/test-ci-locally.sh to test Gitea Actions workflows locally using act_runner
- Created docker-compose.ci.yml for containerized CI test environment
- Updated .gitea/workflows/magnitude.yml to use docker-compose for CI
- Added scripts/README.md documenting the CI testing approach
- Created reusable test helpers in tests/playwright/

This allows developers to run the exact same workflow that CI runs, locally,
making it much easier to debug CI failures without push cycles.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/test-ci-locally.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+# Script to test Gitea Actions workflow locally using act_runner
+# This runs the actual .gitea/workflows/magnitude.yml file in a containerized environment
+
+set -e  # Exit on error
+
+echo "========================================="
+echo "Testing Gitea Actions Workflow Locally"
+echo "========================================="
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Check if .env exists
+if [ ! -f .env ]; then
+    echo -e "${RED}Error: .env file not found!${NC}"
+    echo "Please create .env file with required variables"
+    exit 1
+fi
+
+# Load environment variables from .env for passing as secrets
+echo -e "${YELLOW}Loading environment variables from .env${NC}"
+export $(cat .env | grep -v '^#' | xargs)
+
+# Build secret flags for act_runner
+# These will be available in the workflow as secrets.*
+SECRET_FLAGS=""
+SECRET_FLAGS="$SECRET_FLAGS -s ATPROTO_CLIENT_ID=$ATPROTO_CLIENT_ID"
+SECRET_FLAGS="$SECRET_FLAGS -s ATPROTO_REDIRECT_URI=$ATPROTO_REDIRECT_URI"
+SECRET_FLAGS="$SECRET_FLAGS -s GOOGLE_API_KEY=$GOOGLE_API_KEY"
+SECRET_FLAGS="$SECRET_FLAGS -s DEEPGRAM_API_KEY=$DEEPGRAM_API_KEY"
+SECRET_FLAGS="$SECRET_FLAGS -s SURREAL_JWT_SECRET=$SURREAL_JWT_SECRET"
+SECRET_FLAGS="$SECRET_FLAGS -s TEST_BLUESKY_HANDLE=$TEST_BLUESKY_HANDLE"
+SECRET_FLAGS="$SECRET_FLAGS -s TEST_BLUESKY_PASSWORD=$TEST_BLUESKY_PASSWORD"
+SECRET_FLAGS="$SECRET_FLAGS -s ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY"
+
+echo -e "${YELLOW}Running Gitea Actions workflow with act_runner${NC}"
+echo -e "${YELLOW}This will execute .gitea/workflows/magnitude.yml${NC}"
+
+# Run act_runner in Docker to execute the workflow
+# - Mount Docker socket so act_runner can create containers
+# - Mount current directory as workspace
+# - Pass secrets as flags
+docker run --rm \
+    -v /var/run/docker.sock:/var/run/docker.sock \
+    -v "$(pwd):/workspace" \
+    -w /workspace \
+    -e ACTIONS_CACHE_URL="" \
+    gitea/act_runner:latest \
+    exec -W .gitea/workflows/magnitude.yml \
+    $SECRET_FLAGS || {
+    echo -e "${RED}Workflow execution failed!${NC}"
+    exit 1
+}
+
+echo -e "${GREEN}=========================================${NC}"
+echo -e "${GREEN}Workflow executed successfully!${NC}"
+echo -e "${GREEN}=========================================${NC}"