update docs

Dockerfile_only_txt

@@ -1,5 +1,7 @@
 FROM python:3.11-alpine
 
+# https://docs.docker.com/engine/reference/builder/
+
 # For debugging
 # docker run --rm -v "$(pwd)":/files:ro extract_otp_secrets_only_txt
 # docker build . -t extract_otp_secrets_only_txt -f Dockerfile_only_txt --pull --build-arg RUN_TESTS=false
@@ -12,10 +14,23 @@ COPY . .
 
 ARG RUN_TESTS=true
 
-RUN apk add --no-cache zlib jpeg \
+RUN apk add --no-cache \
+        zlib \
+        jpeg \
     && echo "Arch: $(apk --print-arch)" \
-    && if [[ "$(apk --print-arch)" == "aarch64" ]]; then apk add --no-cache --virtual .build-deps gcc libc-dev python3-dev py3-setuptools zlib-dev jpeg-dev; fi \
-    && pip install --no-cache-dir protobuf qrcode Pillow colorama \
+    && if [[ "$(apk --print-arch)" == "aarch64" ]]; then apk add --no-cache --virtual .build-deps \
+        gcc \
+        libc-dev \
+        python3-dev \
+        py3-setuptools \
+        zlib-dev \
+        jpeg-dev \
+    ; fi \
+    && pip install --no-cache-dir \
+        protobuf \
+        qrcode \
+        Pillow \
+        colorama \
     && if [[ "$(apk --print-arch)" == "aarch64" ]]; then apk del .build-deps; fi \
     && if [[ "$RUN_TESTS" == "true" ]]; then /extract/run_pytest.sh tests/extract_otp_secrets_test.py -k "not qreader" --relaxed; else echo "Not running tests..."; fi