Implement Docker best practices on k32w image (#10041)

Some of these best practices are:
* Multi-stage builds
* Pin versions
* Avoid additional packages installation
* Clean all missing after apt command

Signed-off-by: Victor Morales <v.morales@samsung.com>

integrations/docker/images/chip-build-k32w/Dockerfile

@@ -1,19 +1,26 @@
 ARG VERSION=latest
-FROM connectedhomeip/chip-build:${VERSION}
+FROM connectedhomeip/chip-build:${VERSION} as build
 
-# Setup the K32W SDK
 RUN set -x \
     && apt-get update \
-    && DEBIAN_FRONTEND=noninteractive apt-get install -y wget unzip \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -fy --no-install-recommends \
+    wget=1.20.3-1ubuntu1 \
+    unzip=6.0-25ubuntu1 \
+    && apt-get clean \
     && rm -rf /var/lib/apt/lists/ \
-    && mkdir -p /opt/sdk \
-    && cd /opt/sdk \
-    && wget https://mcuxpresso.nxp.com/eclipse/sdk/2.6.4/plugins/com.nxp.mcuxpresso.sdk.sdk_2.x_k32w061dk6_2.6.4.201911251446.jar \
-    && unzip com.nxp.mcuxpresso.sdk.sdk_2.x_k32w061dk6_2.6.4.201911251446.jar \
-    && rm -rf com.nxp.mcuxpresso.sdk.sdk_2.x_k32w061dk6_2.6.4.201911251446.jar \
-    && cd sdks \
-    && unzip 1190028246d9243d9a9e27ca783413a8.zip \
-    && rm -rf 1190028246d9243d9a9e27ca783413a8.zip \
     && : # last line
 
+WORKDIR /opt/sdk
+# Setup the K32W SDK
+RUN set -x \
+    && wget -O /tmp/sdk.jar https://mcuxpresso.nxp.com/eclipse/sdk/2.6.4/plugins/com.nxp.mcuxpresso.sdk.sdk_2.x_k32w061dk6_2.6.4.201911251446.jar \
+    && unzip /tmp/sdk.jar \
+    && unzip sdks/1190028246d9243d9a9e27ca783413a8.zip -d sdks \
+    && rm -rf sdks/1190028246d9243d9a9e27ca783413a8.zip \
+    && : # last line
+
+FROM connectedhomeip/chip-build:${VERSION}
+
+COPY --from=build /opt/sdk/sdks/ /opt/sdk/sdks/
+
 ENV K32W061_SDK_ROOT=/opt/sdk/sdks

integrations/docker/images/chip-build/version

@@ -1 +1 @@
-0.5.19 Version bump reason: Update AmebaD to not require python2 anymore
+0.5.20 Version bump reason: Improve K32W Docker image