Update go.mod on new go-ipfs release tags

.github/actions/latest-ipfs-tag/Dockerfile

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+FROM golang:1.17
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/latest-ipfs-tag/action.yml

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+name: 'Find latest go-ipfs tag'
+outputs:
+  latest_tag:
+    description: "latest go-ipfs tag name"
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/latest-ipfs-tag/entrypoint.sh

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+#!/usr/bin/env sh
+set -eu
+
+# extract IPFS release
+cd /tmp
+git clone https://github.com/ipfs/go-ipfs.git
+cd go-ipfs
+LATEST_IPFS_TAG=`git describe --tags --abbrev=0`
+echo "The latest IPFS tag is ${LATEST_IPFS_TAG}"
+echo "::set-output name=latest_tag::${LATEST_IPFS_TAG}"

.github/actions/update-on-new-ipfs-tag/Dockerfile

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+FROM golang:1.17
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/update-on-new-ipfs-tag/action.yml

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+name: 'Update on new go-ipfs tag'
+inputs:
+  latest_ipfs_tag:
+      description: "latest go ipfs tag"
+      required: true
+outputs:
+  updated_branch:
+    description: "name of pushed branch with updated doc"
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/update-on-new-ipfs-tag/entrypoint.sh

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+#!/usr/bin/env sh
+set -eu
+
+# extract go-ipfs release tag used in http-api-docs from go.mod in this repo
+CURRENT_IPFS_TAG=`grep 'github.com/ipfs/go-ipfs ' ./go.mod | awk '{print $2}'`
+echo "The currently used IPFS tag is ${CURRENT_IPFS_TAG}"
+
+# extract IPFS release
+LATEST_IPFS_TAG=$INPUT_LATEST_IPFS_TAG
+echo "The latest IPFS tag is ${LATEST_IPFS_TAG}"
+
+# make the upgrade, if newer go-ipfs tags exist
+if [ "$CURRENT_IPFS_TAG" = "$LATEST_IPFS_TAG" ]; then
+    echo "http-api-docs already uses the latest go-ipfs tag."
+else
+     git checkout -b update-ipfs-to-$LATEST_IPFS_TAG
+     sed "s/^\s*github.com\/ipfs\/go-ipfs\s\+$CURRENT_IPFS_TAG\s*$/	github.com\/ipfs\/go-ipfs $LATEST_IPFS_TAG/" go.mod > go.mod2
+     mv go.mod2 go.mod
+     go mod tidy
+     make
+     git config --global user.email "${GITHUB_ACTOR}"
+     git config --global user.name "${GITHUB_ACTOR}@users.noreply.github.com"
+     git add -u
+     git commit -m "Bumped go-ipfs dependence to tag $LATEST_IPFS_TAG."
+     git push -u origin update-ipfs-to-$LATEST_IPFS_TAG
+fi
+echo "::set-output name=updated_branch::update-ipfs-to-$LATEST_IPFS_TAG"

.github/workflows/update-on-new-ipfs-tag.yml

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+name: Update repo on new ipfs-tag release
+on:
+  push:
+  # workflow_dispatch:
+  # schedule:
+  #   - cron: '30 5,17 * * *' # run every day at 5:30am and 5:30pm UTC
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout http-api-docs
+        uses: actions/checkout@v2
+      - name: Find latest go-ipfs tag
+        id: latest_ipfs
+        uses: ./.github/actions/latest-ipfs-tag
+      - name: Update http-api-docs
+        id: update
+        uses: ./.github/actions/update-on-new-ipfs-tag
+        with:
+          latest_ipfs_tag: ${{ steps.latest_ipfs.outputs.latest_tag }}
+      - name: pull-request  # don't create a pr if there was no new ipfs tag
+        uses: repo-sync/pull-request@v2
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          source_branch: ${{ steps.update.outputs.updated_branch }}
+          pr_title: "Bump go-ipfs dependency to ${{ steps.latest_ipfs.outputs.latest_tag }}"