setup go in the nightly release pipeline

Author: techknowlogick

.github/workflows/release-nightly.yml

@@ -62,6 +62,10 @@ jobs:
       # fetch all commits instead of only the last as some branches are long lived and could have many between versions
       # fetch all tags to ensure that "git describe" reports expected Gitea version, eg. v1.21.0-dev-1-g1234567
       - run: git fetch --unshallow --quiet --tags --force
+      - uses: actions/setup-go@v4
+        with:
+          go-version: "~1.21"
+          check-latest: true
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
       - name: Get cleaned branch name
@@ -95,6 +99,10 @@ jobs:
       # fetch all commits instead of only the last as some branches are long lived and could have many between versions
       # fetch all tags to ensure that "git describe" reports expected Gitea version, eg. v1.21.0-dev-1-g1234567
       - run: git fetch --unshallow --quiet --tags --force
+      - uses: actions/setup-go@v4
+        with:
+          go-version: "~1.21"
+          check-latest: true
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
       - name: Get cleaned branch name