Update tagbot for triggered workflow, adjust ci versions

Author: brenhinkeller

.github/workflows/TagBot.yml

@@ -1,11 +1,15 @@
 name: TagBot
 on:
-  schedule:
-    - cron: 0 * * * *
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
 jobs:
   TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}

.github/workflows/ci-integration.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '~1.8.0-0'
+          - '1.8.0-rc1'
         os:
           - ubuntu-latest
           - macOS-latest

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         version:
           - '1.7'
-          - '~1.8.0-0'
+          - '1.8.0-rc1'
         os:
           - ubuntu-latest
           - macOS-latest