Tweak dockerfile generation (#104717)

script/hassfest/docker.py

@@ -4,14 +4,14 @@ from homeassistant.util import executor, thread
 
 from .model import Config, Integration
 
-DOCKERFILE_TEMPLATE = """# Automatically generated by hassfest.
+DOCKERFILE_TEMPLATE = r"""# Automatically generated by hassfest.
 #
 # To update, run python3 -m script.hassfest -p docker
 ARG BUILD_FROM
 FROM ${{BUILD_FROM}}
 
 # Synchronize with homeassistant/core.py:async_stop
-ENV \\
+ENV \
     S6_SERVICES_GRACETIME={timeout}
 
 ARG QEMU_CPU
@@ -21,33 +21,33 @@ WORKDIR /usr/src
 ## Setup Home Assistant Core dependencies
 COPY requirements.txt homeassistant/
 COPY homeassistant/package_constraints.txt homeassistant/homeassistant/
-RUN \\
-    pip3 install \\
-        --only-binary=:all: \\
+RUN \
+    pip3 install \
+        --only-binary=:all: \
         -r homeassistant/requirements.txt
 
 COPY requirements_all.txt home_assistant_frontend-* home_assistant_intents-* homeassistant/
-RUN \\
-    if ls homeassistant/home_assistant_frontend*.whl 1> /dev/null 2>&1; then \\
-        pip3 install homeassistant/home_assistant_frontend-*.whl; \\
-    fi \\
-    && if ls homeassistant/home_assistant_intents*.whl 1> /dev/null 2>&1; then \\
-        pip3 install homeassistant/home_assistant_intents-*.whl; \\
-    fi \\
-    && \\
-        LD_PRELOAD="/usr/local/lib/libjemalloc.so.2" \\
-        MALLOC_CONF="background_thread:true,metadata_thp:auto,dirty_decay_ms:20000,muzzy_decay_ms:20000" \\
-        pip3 install \\
-            --only-binary=:all: \\
+RUN \
+    if ls homeassistant/home_assistant_frontend*.whl 1> /dev/null 2>&1; then \
+        pip3 install homeassistant/home_assistant_frontend-*.whl; \
+    fi \
+    && if ls homeassistant/home_assistant_intents*.whl 1> /dev/null 2>&1; then \
+        pip3 install homeassistant/home_assistant_intents-*.whl; \
+    fi \
+    && \
+        LD_PRELOAD="/usr/local/lib/libjemalloc.so.2" \
+        MALLOC_CONF="background_thread:true,metadata_thp:auto,dirty_decay_ms:20000,muzzy_decay_ms:20000" \
+        pip3 install \
+            --only-binary=:all: \
             -r homeassistant/requirements_all.txt
 
 ## Setup Home Assistant Core
 COPY . homeassistant/
-RUN \\
-    pip3 install \\
-        --only-binary=:all: \\
-        -e ./homeassistant \\
-    && python3 -m compileall \\
+RUN \
+    pip3 install \
+        --only-binary=:all: \
+        -e ./homeassistant \
+    && python3 -m compileall \
         homeassistant/homeassistant
 
 # Home Assistant S6-Overlay