Update major version tag upon releasing (#222)

Part of #211.

Author: krzema12

.github/workflows/release.main.kts

@@ -1,17 +1,24 @@
 #!/usr/bin/env kotlin
 @file:Repository("https://repo1.maven.org/maven2/")
 @file:DependsOn("io.github.typesafegithub:github-workflows-kt:3.0.0")
+@file:DependsOn("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")
 
 @file:Repository("https://bindings.krzeminski.it")
 @file:DependsOn("actions:checkout:v4")
 @file:DependsOn("gradle:actions__setup-gradle:v4")
+@file:OptIn(ExperimentalKotlinLogicStep::class)
 
 import io.github.typesafegithub.workflows.actions.actions.Checkout
 import io.github.typesafegithub.workflows.actions.gradle.ActionsSetupGradle
+import io.github.typesafegithub.workflows.annotations.ExperimentalKotlinLogicStep
 import io.github.typesafegithub.workflows.domain.RunnerType
 import io.github.typesafegithub.workflows.domain.triggers.WorkflowDispatch
 import io.github.typesafegithub.workflows.dsl.expressions.expr
 import io.github.typesafegithub.workflows.dsl.workflow
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 
 workflow(
     name = "Release",
@@ -74,13 +81,39 @@ workflow(
         val versionExpr = expr { "github.event.inputs.version" }
 
         run(
-            name = "Create and push tag",
+            name = "Create and push a patch version tag",
             command = """
                 git tag -a "$versionExpr" -m "Release version $versionExpr"
                 git push origin "$versionExpr"
             """.trimIndent()
         )
 
+        val MAJOR_VERSION_OUTPUT_NAME = "majorVersion"
+
+        val extractMajorVersion = run {
+            // There should be a way to access the inputs using the DSL.
+            // TODO: https://github.com/typesafegithub/github-workflows-kt/issues/1685
+            val githubContextJson = System.getenv("GHWKT_GITHUB_CONTEXT_JSON")!!
+            val version: String = Json.parseToJsonElement(githubContextJson)
+                .jsonObject["event"]
+                ?.jsonObject?.get("inputs")
+                ?.jsonObject?.get("version")
+                ?.jsonPrimitive?.contentOrNull
+                ?: error("Version couldn't be extracted from input")
+            val majorVersion = version.substringBefore(".")
+            outputs[MAJOR_VERSION_OUTPUT_NAME] = majorVersion
+        }
+
+        val majorVersionExpr = expr { "steps.${extractMajorVersion.id}.outputs.$MAJOR_VERSION_OUTPUT_NAME" }
+
+        run(
+            name = "Create or update a major version tag",
+            command = """
+                git tag "$majorVersionExpr" -f
+                git push origin "$majorVersionExpr" -f
+            """.trimIndent()
+        )
+
         run(
             name = "Delete temp branch",
             command = "git push origin --delete $tempBranchName"

.github/workflows/release.yaml

@@ -58,10 +58,19 @@ jobs:
       name: 'Push commit'
       run: 'git push --set-upstream origin temp-branch-for-release'
     - id: 'step-7'
-      name: 'Create and push tag'
+      name: 'Create and push a patch version tag'
       run: |-
         git tag -a "${{ github.event.inputs.version }}" -m "Release version ${{ github.event.inputs.version }}"
         git push origin "${{ github.event.inputs.version }}"
     - id: 'step-8'
+      env:
+        GHWKT_GITHUB_CONTEXT_JSON: '${{ toJSON(github) }}'
+      run: 'GHWKT_RUN_STEP=''release:step-8'' ''.github/workflows/release.main.kts'''
+    - id: 'step-9'
+      name: 'Create or update a major version tag'
+      run: |-
+        git tag "${{ steps.step-8.outputs.majorVersion }}" -f
+        git push origin "${{ steps.step-8.outputs.majorVersion }}" -f
+    - id: 'step-10'
       name: 'Delete temp branch'
       run: 'git push origin --delete temp-branch-for-release'