Updated BuildServices (asciidoc)

BuildServices.asciidoc

@@ -3,113 +3,32 @@
 Building your code on Circle CI is useful to check regressions against the master and devel branches of Nim.
 Same for your code documentation.
 
-Configure the build:
-
-Under Test Commands >> Dependency Commands >> Pre-dependency commands:
-[source,sh]
-----
-wget http://http.us.debian.org/debian/pool/main/n/nim/nim_0.18.0-2_amd64.deb 
-wget http://http.us.debian.org/debian/pool/main/o/openssl/libssl1.1_1.1.0h-4_amd64.deb 
-sudo dpkg -i *_amd64.deb
-----
-
-Under Test Commands >> Test Commands >> Test Commands:
-[source,sh]
-----
-# This will fetch Nimble dependencies
-nimble build -y
-nim c -r <mytest.nim>
-----
-
-Be aware that the available .deb packages will change over time.
-
-## Building Nim projects on Circle CI v2.0 using choosenim
-
-choosenim allow picking fixed Nim versions or updating to the last stable or devel version
+The Nim docker image contains the latest version.
 
 Use this .circleci/config.yml
 
-[source,yaml]
----
-version: 2
-jobs:
-  build:
-    machine: true
-    steps:
-      - run: echo 'export PATH=~/.nimble/bin:$PATH' >> $BASH_ENV
-      - checkout
-      # Reuse cached Nim compiler
-      - restore_cache:
-          key: compiler-0002
-      - run:
-          command: |
-            if [ -f ~/.nimble/bin/choosenim ]; then
-              echo "Updating Nim using choosenim"
-              choosenim stable
-            else
-              echo "Installing choosenim and Nim"
-              wget https://raw.githubusercontent.com/dom96/choosenim/master/scripts/choosenim-unix-init.sh
-              sh choosenim-unix-init.sh -y
-            fi
-      - save_cache:
-          key: compiler-0002
-          paths:
-            - ~/.nimble
-            - ~/.choosenim
-      - run:
-          command: |
-            nimble build -y
-            # add here your tests
----
-
-## Building Nim projects on Circle CI v2.0 using Nim Devel
-
-Create .circleci/config.yml as:
-
 [source,yaml]
 ----
 version: 2
 jobs:
   build:
-    machine: true
+    docker:
+      - image: nimlang/nim
     steps:
-      - run: echo 'export PATH=./Nim/bin:$PATH' >> $BASH_ENV
+      - run: echo 'export PATH=~/.nimble/bin:$PATH' >> $BASH_ENV
       - checkout
-      # Reuse cached Nim compiler
+      # Reuse cached directories
       - restore_cache:
-          key: compiler-0000
+          key: nim-0000
       - run:
           command: |
-            if [ -d Nim ]; then
-              cd Nim
-              git fetch
-              if [ "$(git rev-parse HEAD)" == "$(git rev-parse @{u})" ]; then
-                echo "Nim is up to date"
-                build_nim=false
-              else
-                echo "pulling new Nim commits"
-                build_nim=true
-                git pull
-              fi
-            else
-              echo "cloning Nim for the first time"
-              build_nim=true
-              git clone --depth 1 https://github.com/nim-lang/Nim.git
-              cd Nim
-              git clone --depth 1 git://github.com/nim-lang/csources.git csources
-              cd csources
-              sh build.sh
-              cd ..
-            fi
-            if [ "$build_nim" = true ]; then
-              ./bin/nim c koch
-              ./koch boot -d:release
-              ./koch tools
-            fi
+            # Example: adding OS libraries
+            apt-get update
+            apt-get install -y --no-install-recommends libsodium23
       - save_cache:
-          key: compiler-0000
+          key: nim-0000
           paths:
-            - Nim
+            - .nimble
       - run: nimble build -y
       - run: nim c -r <mytest.nim>
       - store_artifacts: