use kerl to install specific erlang version. ref #100

.github/workflows/ci.yml

@@ -19,56 +19,62 @@ jobs:
       fail-fast: false
       matrix:
         otp_vsn:
-          - '18'
+          - '18.0'
           # - '18.1 # git : Depends: libpcre2-8-0 but it is not installable
           # - '18.2' # git : Depends: libpcre2-8-0 but it is not installable
           - '18.3'
-          - '19'
+          - '19.0'
           # - '19.1' # git : Depends: libpcre2-8-0 but it is not installable
           # - '19.2' # git : Depends: libpcre2-8-0 but it is not installable
           - '19.3'
-          - '20'
+          - '20.0'
           # - '20.1' # git : Depends: libpcre2-8-0 but it is not installable
           - '20.2'
           - '20.3'
-          # - '21'
+          # - '21.0'
           - '21.1'
           - '21.2'
           - '21.3'
-          - '22'
+          - '22.0'
           - '22.1'
           - '22.2'
           - '22.3'
-          - '23'
+          - '23.0'
           - '23.1'
     name: 'ci-erl:${{ matrix.otp_vsn }}'
     runs-on: ubuntu-latest
-    container:
-      image: 'erlang:${{ matrix.otp_vsn }}'
     env:
       LATEST_OTP_RELEASE: 23.1
     steps:
       - shell: bash
         run: |
-          # upgrade git to 2.18+ for actions/checkout@v2
+          # install erlang via kerl
           set -euo pipefail
           set -x
-          # some erlang containers are based on jesse, some or stretch, etc
-          # NOTE jesse has no VERSION_CODENAME in /etc/os-release
-          # NOTE lsb_release is not installed
-          # see https://unix.stackexchange.com/questions/180776/how-to-get-debian-codename-without-lsb-release
-          VERSION_CODENAME=$(dpkg --status tzdata|grep Provides|cut -f2 -d'-')
-          VCB=${VERSION_CODENAME}-backports
-          echo "deb http://cloudfront.debian.net/debian ${VCB} main" >>/etc/apt/sources.list.d/${VCB}.list
-          echo "deb-src http://cloudfront.debian.net/debian ${VCB} main" >>/etc/apt/sources.list.d/${VCB}.list
-          apt-get update -y --fix-missing -o Acquire::Check-Valid-Until=false
-          apt-get -t ${VCB} install -y git
+          sudo curl -o /usr/local/bin/kerl https://raw.githubusercontent.com/kerl/kerl/master/kerl
+          sudo chmod +x /usr/local/bin/kerl
+          kerl update releases
+          kerl build ${{ matrix.otp_vsn }} ${{ matrix.otp_vsn }}
+          kerl install ${{ matrix.otp_vsn }} ~/kerl/${{ matrix.otp_vsn }}
+          set +x
+          echo source ~/kerl/${{ matrix.otp_vsn }}/activate
+          source ~/kerl/${{ matrix.otp_vsn }}/activate
+          set -x
+          erl --version
       - uses: actions/checkout@v2
       - shell: bash
         run: |
           # run linter and docs if latest otp release
+          source ~/kerl/${{ matrix.otp_vsn }}/activate
+          erl --version
           [[ "${{ matrix.otp_vsn }}" != "${{ env.LATEST_OTP_RELEASE }}" ]] || make elvis docs
       - shell: bash
-        run: make
+        run: |
+          source ~/kerl/${{ matrix.otp_vsn }}/activate
+          erl --version
+          make
       - shell: bash
-        run: make test
+        run: |
+          source ~/kerl/${{ matrix.otp_vsn }}/activate
+          erl --version
+          make test