fix(rag): Always run download phase before ingestion phases

The gesetze phase failed because it expects text files created by the
download phase. Now the workflow automatically runs download first for
any phase that depends on it. Also adds git and python3 to the alpine
container for repo cloning and text extraction.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/rag-ingest.yaml

@@ -78,12 +78,19 @@ jobs:
             -e "SDK_URL=http://bp-compliance-ai-sdk:8090" \
             alpine:3.19 \
             sh -c "
-              apk add --no-cache curl bash coreutils > /dev/null 2>&1
+              apk add --no-cache curl bash coreutils git python3 > /dev/null 2>&1
               mkdir -p /tmp/rag-ingestion/{pdfs,repos,texts}
               cd /workspace
               if [ '${PHASE}' = 'all' ]; then
                 bash scripts/ingest-legal-corpus.sh
+              elif [ '${PHASE}' = 'download' ]; then
+                bash scripts/ingest-legal-corpus.sh --only download
               else
+                # Download-Phase muss immer zuerst laufen (erstellt Textdateien)
+                echo '=== Running download phase first ==='
+                bash scripts/ingest-legal-corpus.sh --only download
+                echo ''
+                echo '=== Running phase: ${PHASE} ==='
                 bash scripts/ingest-legal-corpus.sh --only '${PHASE}'
               fi
             "