ci: handle multiline commit messages in release workflow

Use base64 encoding/decoding to safely pass commit messages through environment variables in the latest-prerelease workflow.

.github/workflows/latest-prerelease.yml

@@ -35,7 +35,7 @@ jobs:
         id: commit_info
         run: |
           echo "sha=$(git rev-parse HEAD)" >> $GITHUB_ENV
-          echo "message=$(git log -1 --pretty=%B)" >> $GITHUB_ENV
+          echo "message=$(git log -1 --pretty=%B | base64 -w 0)" >> $GITHUB_ENV
 
       # Check if "latest" prerelease exists
       - name: Check for Existing Latest Prerelease
@@ -61,15 +61,16 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
+          decoded_message=$(echo "$message" | base64 -d)
           curl -X POST \
             -H "Authorization: token $GITHUB_TOKEN" \
             -H "Accept: application/vnd.github+json" \
             https://api.github.com/repos/${{ github.repository }}/releases \
-            -d "$(jq -n --arg sha "$sha" --arg message "$message" '{
+            -d "$(jq -n --arg sha "$sha" --arg message "$decoded_message" '{
               tag_name: "latest",
               target_commitish: $sha,
               name: "Latest Prerelease",
-              body: "Automatically updated to latest commit:\n\n\($message)",
+              body: "Automatically updated to latest commit:\n\n" + $message,
               draft: false,
               prerelease: true
             }')"
@@ -80,11 +81,12 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
+          decoded_message=$(echo "$message" | base64 -d)
           curl -X PATCH \
             -H "Authorization: token $GITHUB_TOKEN" \
             -H "Accept: application/vnd.github+json" \
             https://api.github.com/repos/${{ github.repository }}/releases/${{ env.release_id }} \
-            -d "$(jq -n --arg sha "$sha" --arg message "$message" '{
+            -d "$(jq -n --arg sha "$sha" --arg message "$decoded_message" '{
               tag_name: "latest",
               target_commitish: $sha,
               name: "Latest Prerelease",