Set up automation settings for the v0.36.x backport branch. (#8714)

- Add Mergify settings for backport labels.
- Add e2e nightly workflow for v0.36.x.
- Update documentation on e2e workflows.
- Add v0.36.x to the Dependabot configs.

.github/dependabot.yml

@@ -11,6 +11,17 @@ updates:
       - T:dependencies
       - S:automerge
 
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: monday
+    target-branch: "v0.34.x"
+    open-pull-requests-limit: 10
+    labels:
+      - T:dependencies
+      - S:automerge
+
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
@@ -27,7 +38,7 @@ updates:
     schedule:
       interval: weekly
       day: monday
-    target-branch: "v0.34.x"
+    target-branch: "v0.36.x"
     open-pull-requests-limit: 10
     labels:
       - T:dependencies
@@ -73,3 +84,13 @@ updates:
     labels:
       - T:dependencies
       - S:automerge
+
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: daily
+    target-branch: "v0.36.x"
+    open-pull-requests-limit: 10
+    labels:
+      - T:dependencies
+      - S:automerge

.github/mergify.yml

@@ -33,3 +33,11 @@ pull_request_rules:
       backport:
         branches:
           - v0.35.x
+  - name: backport patches to v0.36.x branch
+    conditions:
+      - base=master
+      - label=S:backport-to-v0.36.x
+    actions:
+      backport:
+        branches:
+          - v0.36.x

.github/workflows/e2e-nightly-34x.yml

@@ -1,8 +1,7 @@
-# Runs randomly generated E2E testnets nightly
-# on the 0.34.x release branch
+# Runs randomly generated E2E testnets nightly on the 0.34.x branch.
 
-# !! If you change something in this file, you probably want
-# to update the e2e-nightly-master workflow as well!
+# !! This file should be kept in sync with the e2e-nightly-master.yml file,
+# modulo changes to the version labels.
 
 name: e2e-nightly-34x
 on:

.github/workflows/e2e-nightly-35x.yml

@@ -1,7 +1,7 @@
-# Runs randomly generated E2E testnets nightly on v0.35.x.
+# Runs randomly generated E2E testnets nightly on the v0.35.x branch.
 
-# !! If you change something in this file, you probably want
-# to update the e2e-nightly-master workflow as well!
+# !! This file should be kept in sync with the e2e-nightly-master.yml file,
+# modulo changes to the version labels.
 
 name: e2e-nightly-35x
 on:

.github/workflows/e2e-nightly-36x.yml

@@ -0,0 +1,74 @@
+# Runs randomly generated E2E testnets nightly on the v0.36.x branch.
+
+# !! This file should be kept in sync with the e2e-nightly-master.yml file,
+# modulo changes to the version labels.
+
+name: e2e-nightly-36x
+on:
+  schedule:
+    - cron: '0 2 * * *'
+
+jobs:
+  e2e-nightly-test:
+    # Run parallel jobs for the listed testnet groups (must match the
+    # ./build/generator -g flag)
+    strategy:
+      fail-fast: false
+      matrix:
+        group: ['00', '01', '02', '03']
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.18'
+
+      - uses: actions/checkout@v3
+        with:
+          ref: 'v0.36.x'
+
+      - name: Build
+        working-directory: test/e2e
+        # Run make jobs in parallel, since we can't run steps in parallel.
+        run: make -j2 docker generator runner tests
+
+      - name: Generate testnets
+        working-directory: test/e2e
+        # When changing -g, also change the matrix groups above
+        run: ./build/generator -g 4 -d networks/nightly
+
+      - name: Run testnets in group ${{ matrix.group }}
+        working-directory: test/e2e
+        run: ./run-multiple.sh networks/nightly/*-group${{ matrix.group }}-*.toml
+
+  e2e-nightly-fail-2:
+    needs: e2e-nightly-test
+    if: ${{ failure() }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack on failure
+        uses: rtCamp/action-slack-notify@12e36fc18b0689399306c2e0b3e0f2978b7f1ee7
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_CHANNEL: tendermint-internal
+          SLACK_USERNAME: Nightly E2E Tests
+          SLACK_ICON_EMOJI: ':skull:'
+          SLACK_COLOR: danger
+          SLACK_MESSAGE: Nightly E2E tests failed on v0.36.x
+          SLACK_FOOTER: ''
+
+  e2e-nightly-success:  # may turn this off once they seem to pass consistently
+    needs: e2e-nightly-test
+    if: ${{ success() }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack on success
+        uses: rtCamp/action-slack-notify@12e36fc18b0689399306c2e0b3e0f2978b7f1ee7
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_CHANNEL: tendermint-internal
+          SLACK_USERNAME: Nightly E2E Tests
+          SLACK_ICON_EMOJI: ':white_check_mark:'
+          SLACK_COLOR: good
+          SLACK_MESSAGE: Nightly E2E tests passed on v0.36.x
+          SLACK_FOOTER: ''

.github/workflows/e2e-nightly-master.yml

@@ -1,7 +1,8 @@
 # Runs randomly generated E2E testnets nightly on master
 
-# !! If you change something in this file, you probably want
-# to update the e2e-nightly-34x workflow as well!
+# !! Relevant changes to this file should be propagated to the e2e-nightly-<V>x
+# files for the supported backport branches, when appropriate, modulo version
+# markers.
 
 name: e2e-nightly-master
 on: