CI: use ubuntu-slim instead of ubuntu-latest where sensible (#498)

Author: fingolfin

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ permissions:
   pull-requests: write
 jobs:
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     if: github.event_name == 'workflow_dispatch' || (startsWith(github.event.pull_request.head.ref, 'release/') && github.event.pull_request.merged)
     steps:
       - uses: actions/checkout@v6

.github/workflows/tagbot.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:

.github/workflows/web.yml

@@ -19,7 +19,7 @@ on:
       - '.github/workflows/web.yml'
 jobs:
   check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4

README.md

@@ -298,7 +298,7 @@ With the removal of the lookback time window, TagBot now checks all package vers
 ```yml
 jobs:
   TagBot:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     env:
       TAGBOT_MAX_PRS_TO_CHECK: 500  # Increase limit if needed
     steps:

example.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with: