.github: goofing around with more automation

.github/workflows/test_dep_update.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p gh jq
+set -e
+echo "$GITHUB_API_TOKEN" | gh auth --with-token
+git branch -d depupdate || true
+git branch depupdate
+git checkout depupdate
+json="$(gh pr list --search "author:app/github-actions" --json headRefName,number)"
+echo "$json" | jq '.[] | .headRefName | @text' | xargs -L1 -- git pull --rebase origin
+if nix flake check; then
+    #echo "$json" | jq ".[] | .number | @text" | xargs gh pr merge
+    echo wouldve merged-all
+else
+    gh issue create \
+        --title "Recent Dependency update PRs failing tests" \
+        --body "I tried to combine these PRs and they failed the test: $(echo "$json" | jq ".[] | .number | @text" | xargs echo '#')"
+fi

.github/workflows/tmp-postupdate.yml

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+name: "tmp postupdate"
+on:
+  workflow_dispatch:
+jobs:
+  update-deps:
+    name: Update dependencies
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+          # Nix Flakes doesn't work on shallow clones
+          fetch-depth: 0
+    - uses: cachix/install-nix-action@v12
+      with:
+        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20201221_9fab14a/install
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+    - name: Run test_dep_update
+      env:
+        GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        GITHUB_BASE_BRANCH: develop
+      run: |
+        ./test_dep_update.sh