Automate releases to SDKMAN (#13885)

Author: lwronski

.github/workflows/releases.yml

@@ -0,0 +1,24 @@
+name: Releases
+on:
+  workflow_dispatch:
+
+jobs:
+  publish_release:
+    runs-on: [self-hosted, Linux]
+    container:
+      image: lampepfl/dotty:2021-03-22
+      options: --cpu-shares 4096
+
+    env:
+      SDKMAN_KEY: ${{ secrets.SDKMAN_KEY }} 
+      SDKMAN_TOKEN: ${{ secrets.SDKMAN_TOKEN }}
+      
+    steps:
+      - name: Reset existing repo
+        run: git -c "http.https://github.com/.extraheader=" fetch --recurse-submodules=no "https://github.com/lampepfl/dotty" && git reset --hard FETCH_HEAD || true
+
+      - name: Cleanup
+        run: .github/workflows/cleanup.sh
+
+      - name: Publish to SDKMAN
+        run: .github/workflows/scripts/publish-sdkman.sh

.github/workflows/scripts/publish-sdkman.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+# This is script for publishing scala on SDKMAN.
+# Script resolves the latest stable version of scala and then send REST request to SDKMAN Vendor API.
+# It's releasing and announcing the release of scala on SDKMAN.
+#
+# Requirement:
+#   - the latest stable version of scala should be available in github artifacts
+
+set -u
+
+# latest stable dotty version 
+DOTTY_VERSION=$(curl -s https://api.github.com/repos/lampepfl/dotty/releases/latest  | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
+DOTTY_URL="https://github.com/lampepfl/dotty/releases/download/$DOTTY_VERSION/scala3-$DOTTY_VERSION.zip"
+
+# checking if dotty version is available 
+if ! curl --output /dev/null --silent --head --fail "$DOTTY_URL"; then
+  echo "URL doesn't exist: $DOTTY_URL"
+  exit 1
+fi
+
+# Release a new Candidate Version
+curl --silent --show-error --fail \
+    -X POST \
+    -H "Consumer-Key: $SDKMAN_KEY" \
+    -H "Consumer-Token: $SDKMAN_TOKEN" \
+    -H "Content-Type: application/json" \
+    -H "Accept: application/json" \
+    -d '{"candidate": "scala", "version": "'"$DOTTY_VERSION"'", "url": "'"$DOTTY_URL"'"}' \
+    https://vendors.sdkman.io/release
+
+if [[ $? -ne 0 ]]; then
+  echo "Fail sending POST request to releasing scala on SDKMAN."
+  exit 1
+fi
+
+# Set DOTTY_VERSION as Default for Candidate
+curl --silent --show-error --fail \
+    -X PUT \
+    -H "Consumer-Key: $SDKMAN_KEY" \
+    -H "Consumer-Token: $SDKMAN_TOKEN" \
+    -H "Content-Type: application/json" \
+    -H "Accept: application/json" \
+    -d '{"candidate": "scala", "version": "'"$DOTTY_VERSION"'"}' \
+    https://vendors.sdkman.io/default
+
+if [[ $? -ne 0 ]]; then
+  echo "Fail sending PUT request to announcing the release of scala on SDKMAN."
+  exit 1
+fi

docs/docs/contributing/checklist.sh

@@ -48,6 +48,7 @@ LIST='- [ ] Publish artifacts to Maven via CI
   - [ ] Publish Blog Post on dotty.epfl.ch
   - [ ] Make an announcement thread on https://contributors.scala-lang.org
   - [ ] Tweet the announcement blog post on https://twitter.com/scala_lang
+  - [ ] Run workflow releases CI to publish scala on SDKMAN - https://github.com/lampepfl/dotty/actions/workflows/releases.yml
 
 [Instructions on how to release](https://dotty.epfl.ch/docs/contributing/release.html)'