fix bump/ci actions to support new gitea runner

.gitea/workflows/bump.yaml

@@ -2,7 +2,14 @@ name: Bump
 on:
   schedule:
     - cron: '0 5 * * *'
-  workflow_dispatch: {}
+  workflow_dispatch:
+    inputs:
+      version:
+        description: >-
+          Upstream gitea/runner version to bump to (e.g. 3.4.0, no leading
+          "v"). Leave empty to use the latest upstream release.
+        required: false
+        type: string
 
 jobs:
   bump:
@@ -19,7 +26,14 @@ jobs:
         id: check
         env:
           BUMP_TOKEN: ${{ secrets.BUMP_TOKEN }}
+          BUMP_VERSION: ${{ inputs.version }}
         run: |
+          # An explicitly requested version always runs the full bump.
+          if [ -n "${BUMP_VERSION}" ]; then
+            echo "needed=true" >> "$GITHUB_OUTPUT"
+            echo "explicit version requested: ${BUMP_VERSION}"
+            exit 0
+          fi
           latest=$(wget -qO- https://gitea.com/gitea/runner/releases.rss \
             | grep -oE '<title>v[0-9]+\.[0-9]+\.[0-9]+</title>' \
             | head -1 | sed -E 's#</?title>##g; s/^v//')
@@ -51,6 +65,12 @@ jobs:
             > /etc/portage/repos.conf/gentoo.conf
           sed -i '/^verify-signature/d' /etc/portage/binrepos.conf/gentoo.conf
           printf '\nverify-signature = false\n' >> /etc/portage/binrepos.conf/gentoo.conf
+          # Upstream's go.mod can require a Go that Gentoo only has under
+          # ~amd64 (GOTOOLCHAIN=local forbids auto-download), so accept the
+          # testing-keyworded dev-lang/go. It is built from source when no
+          # stable binpkg satisfies the requirement.
+          mkdir -p /etc/portage/package.accept_keywords
+          echo 'dev-lang/go ~amd64' > /etc/portage/package.accept_keywords/go
           emerge -q --getbinpkg \
             dev-vcs/git net-misc/curl app-arch/xz-utils app-misc/jq \
             dev-lang/go dev-util/pkgdev
@@ -59,6 +79,7 @@ jobs:
         if: steps.check.outputs.needed == 'true'
         env:
           BUMP_TOKEN: ${{ secrets.BUMP_TOKEN }}
+          BUMP_VERSION: ${{ inputs.version }}
         run: |
           host=${GITHUB_SERVER_URL#http://}; host=${host#https://}
           curl -fsSL "http://x-access-token:${BUMP_TOKEN}@${host}/${GITHUB_REPOSITORY}/raw/branch/master/scripts/bump-version.sh" \