Alpine image: Fix missing OSD and path

.docker/Dockerfile.alpine

@@ -41,6 +41,7 @@ RUN apk add --no-cache \
     tesseract-ocr-data-deu \
     tesseract-ocr-data-eng \
     tesseract-ocr-data-fra \
+    tesseract-ocr-data-osd \
     tesseract-ocr-data-por \
     tesseract-ocr-data-spa \
     ttf-droid \
@@ -61,4 +62,6 @@ COPY --from=builder /app/misc/watcher.py /app/
 COPY --from=builder /app/pyproject.toml /app/README.md /app/
 COPY --from=builder /app/tests /app/tests
 
+ENV PATH="/app/.venv/bin:${PATH}"
+
 ENTRYPOINT ["/app/.venv/bin/ocrmypdf"]