Publish to the runner local Gitea registry

.gitea/workflows/ci.yaml

@@ -39,12 +39,12 @@ jobs:
 
       - name: Configure Registry Auth
         env:
-          REGISTRY_HOST: ${{ vars.REGISTRY_HOST }}
           REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
         run: |
+          push_host="$(git remote get-url origin | sed -E 's#^[a-z]+://([^/]+)/.*#\1#')"
           mkdir -p "${HOME}/.docker"
           auth="$(printf '%s:%s' "${GITHUB_REPOSITORY_OWNER}" "${REGISTRY_PASSWORD}" | base64 -w0)"
-          printf '{"auths":{"%s":{"auth":"%s"}}}\n' "${REGISTRY_HOST}" "${auth}" > "${HOME}/.docker/config.json"
+          printf '{"auths":{"%s":{"auth":"%s"}}}\n' "${push_host}" "${auth}" > "${HOME}/.docker/config.json"
           chmod 600 "${HOME}/.docker/config.json"
 
       - name: Install ko
@@ -52,8 +52,8 @@ jobs:
 
       - name: Build and Push Image
         env:
-          REGISTRY_HOST: ${{ vars.REGISTRY_HOST }}
           KO_DEFAULTBASEIMAGE: gcr.io/distroless/static-debian12:nonroot
         run: |
-          export KO_DOCKER_REPO="${REGISTRY_HOST}/${GITHUB_REPOSITORY_OWNER}"
+          push_host="$(git remote get-url origin | sed -E 's#^[a-z]+://([^/]+)/.*#\1#')"
+          export KO_DOCKER_REPO="${push_host}/${GITHUB_REPOSITORY_OWNER}"
           ko build --base-import-paths --insecure-registry --sbom=none --tags "main,sha-${GITHUB_SHA}" .

README.md

@@ -57,7 +57,7 @@ It runs on pushes to `main` and pull requests, and currently:
 - runs `go build .`
 - builds and pushes `:main` and `:sha-<commit>` container tags on pushes to `main`
 
-The workflow expects a runner with the `ubuntu-latest` label, a repository Actions secret named `REGISTRY_PASSWORD`, and a repository variable named `REGISTRY_HOST` for the registry hostname.
+The workflow expects a runner with the `ubuntu-latest` label and a repository Actions secret named `REGISTRY_PASSWORD`.
 
 The cluster runner deployed for this repo provides the required runner label.