Fix newsletter ci formatting (#1475)

Author: AngelOnFira

.github/create_newsletter_scaffold.sh

@@ -17,10 +17,17 @@ if [[ -z "${NEWSLETTER_COUNTER}" ]]; then
   exit 1
 fi
 
+# NEWSLETTER_NEXT_MONTH_NUMBER
+if [[ -z "${NEWSLETTER_NEXT_MONTH_NUMBER}" ]]; then
+  echo "NEWSLETTER_NEXT_MONTH_NUMBER is not set. Exiting..."
+  exit 1
+fi
+
 cp .github/newsletter-template.md index.md
 sed -i "s/{{\s*NEWSLETTER_MONTH\s*}}/${NEWSLETTER_MONTH}/g" index.md
 sed -i "s/{{\s*NEWSLETTER_YEAR\s*}}/${NEWSLETTER_YEAR}/g" index.md
 sed -i "s/{{\s*NEWSLETTER_COUNTER\s*}}/${NEWSLETTER_COUNTER}/g" index.md
+sed -i "s/{{\s*NEWSLETTER_NEXT_MONTH_NUMBER\s*}}/${NEWSLETTER_NEXT_MONTH_NUMBER}/g" index.md
 # Create a dir in content/news with the counter with 3 digits as name
 destination="content/news/$(printf "%03d" ${NEWSLETTER_COUNTER})"
 mkdir -p $destination

.github/newsletter-issue-template.md

@@ -1,15 +1,14 @@
 ---
 title: "Newsletter {{ env.NEWSLETTER_COUNTER}}: {{ env.NEWSLETTER_MONTH }} {{ env.NEWSLETTER_YEAR }}"
 labels: coordination, help wanted
-assignees: janhohenheim
+assignees: AngelOnFira, mamaicode, janhohenheim
 ---
 
-###### tags: `newsletter`
+# Newsletter {{ env.NEWSLETTER_COUNTER}}: {{ env.NEWSLETTER_MONTH }} {{ env.NEWSLETTER_YEAR }}
 
-**Editors:**
+**Editors:** @janhohenheim, @AngelOnFira, @mamaicode
 
-Another month has gone by, so it's time to put together the Rust Gamedev
-newsletter with {{ env.NEWSLETTER_MONTH }}'s news!
+Another month has gone by, so it's time to put together the Rust Gamedev newsletter with {{ env.NEWSLETTER_MONTH }}'s news!
 
 ## Current Schedule