CI: compute package version and use it job spec

Author: ManasJayanth

.ci/esy-build-steps.yml

@@ -7,7 +7,10 @@ steps:
       versionSpec: '18.16.0'
   - bash: |
       NPM_CACHE_DIR=$(npm config get cache)
+      ESY_BASH_VERSION=$(node -e 'console.log(require("./package.json").version)')
       echo "##vso[task.setvariable variable=NPM_CACHE_DIR]$NPM_CACHE_DIR"
+      echo "##vso[task.setvariable variable=ESY_BASH_VERSION]$ESY_BASH_VERSION"
+    displayName: Compute pipeline variables
   - task: Cache@2
     inputs:
       key: 'npm | "$(Build.SourcesDirectory)/package-lock.json"'
@@ -26,8 +29,8 @@ steps:
   - task: PublishBuildArtifacts@1
     displayName: 'Release Package'
     inputs:
-        PathtoPublish: './esy-bash-0.3.21.tgz'
-        ArtifactName: npm-package
+        PathtoPublish: './esy-bash-$(ESY_BASH_VERSION).tgz'
+        ArtifactName: esy-bash-$(ESY_BASH_VERSION)
   - script: node postinstall.js
     displayName: "node postinstall.js (iteration 1)"
   # TODO Figure e2e test