US-620855 Add detemplatize executable using multi stage docker build (#…

…217)

* detemplatize library included

* removed instructions to copy the detemplatize executable.

* Reverted removal and re-added Dockerfile location and note.

* Removed explicit latest tag for detemplatize image

Dockerfile

@@ -1,8 +1,10 @@
 # Dockerfile for Pega 8 Platform
 
 # Base image to extend from
-
 ARG BASE_TOMCAT_IMAGE
+
+FROM pegasystems/detemplatize as detemplatize
+
 FROM $BASE_TOMCAT_IMAGE as release
 
 ARG VERSION
@@ -18,6 +20,8 @@ RUN groupadd -g 9001 pegauser && \
 
 
 ENV PEGA_DOCKER_VERSION=${VERSION:-CUSTOM_BUILD}
+# Copy detemplatize to base image bin directory
+COPY --from=detemplatize /bin/detemplatize /bin/detemplatize
 
 COPY hashes/ /hashes/
 COPY keys/ /keys/

docs/Building-Image-With-Own-OS-And-JDK.md

@@ -8,24 +8,9 @@ Prerequisites:
 Pega provides a pega-web-ready Docker image using Tomcat 9 and JDK 11 as a base image. For more information about the pega-web-ready Docker image, see `pegasystems/docker-pega-web-ready`
 To build a custom pega-web-ready image using your preferred OS and JDK, perform the following actions:
 
-1. Create a Dockerfile for your custom pega-web-ready image using your base image.
-
-   a. Use multi-stage Docker build at the beginning of your Dockerfile to copy the detemplatize executive file from the `pegasystems/detemplatize` Docker image to your base image.
-      The detemplatize executive file replaces template variables with actual values in the Pega Platform code.
-
-   For example:
-      ```Dockerfile
-      FROM pegasystems/detemplatize AS builder
-      # Base Image to be used to build pega-ready image 
-      FROM <BASE_IMAGE>
-      # Copy detemplatize to base image bin directory
-      COPY --from=builder /bin/detemplatize /bin/detemplatize 
-      ```
-
-   b. Use the open-source pega-web-ready Dockerfile code to complete the Dockerfile.
-      For more information, see pegasystems/docker-pega-web-ready/Dockerfile.
-      Note: You can add any extra environment variables needed in the Dockerfile as per your use-case.
-
+1. Create a Dockerfile for your custom pega-web-ready image using your base image and the open-source pega-web-ready Dockerfile code. 
+   For more information, see pegasystems/docker-pega-web-ready/Dockerfile.
+   Note: You can add any extra environment variables needed in the Dockerfile as per your use-case.
 
 2. Use the following command to build the custom pega-web-ready image using the base image as an argument.
      ```bash