Report K3d version as an output

Signed-off-by: Sergey Vasilyev <nolar@nolar.info>

README.md

@@ -116,6 +116,11 @@ resources to appear (e.g., for a service account named "default").
 
 ## Outputs
 
+### `k3d-version`
+
+The specific K3d version that was detected and used. E.g. `v5.0.0`.
+
+
 ### `k3s-version`
 
 The specific K3s version that was detected and used. E.g. `v1.21.2+k3s1`.

action.sh

@@ -58,10 +58,6 @@ fi
 K3S=$(jq --slurp <<< "$versions_matching" --raw-output '.[0]')
 K8S=${K3S%%+*}
 
-# Communicate back to GitHub Actions.
-echo "::set-output name=k3s-version::${K3S}"
-echo "::set-output name=k8s-version::${K8S}"
-
 # Install K3d and start a K3s cluster. It takes 20 seconds usually.
 # Name & args can be empty or multi-value. For this, they are not quoted.
 if [[ "${K3D_TAG:-}" == "latest" ]]; then
@@ -70,6 +66,17 @@ fi
 curl --silent --fail https://raw.githubusercontent.com/rancher/k3d/main/install.sh \
   | TAG=${K3D_TAG:-} bash
 k3d --version
+K3D=$(k3d --version | grep -Po 'k3d version \K(v[\S]+)' || true )
+
+# Communicate back to GitHub Actions.
+echo "Detected k3d-version::${K3D}"
+echo "Detected k3s-version::${K3S}"
+echo "Detected k8s-version::${K8S}"
+echo "::set-output name=k3d-version::${K3D}"
+echo "::set-output name=k3s-version::${K3S}"
+echo "::set-output name=k8s-version::${K8S}"
+
+# Start a cluster. It takes 20 seconds usually.
 k3d cluster create ${K3D_NAME:-} --wait --image=rancher/k3s:"${K3S//+/-}" ${K3D_ARGS:-}
 
 # Sometimes, the service account is not created immediately. Nice trick, but no:

action.yaml

@@ -26,6 +26,9 @@ inputs:
     description: Skip waiting for full cluster readiness?
     required: false
 outputs:
+  k3d-version:
+    description: Actual version of K3d detected and used.
+    value: ${{ steps.main.outputs.k3d-version }}
   k3s-version:
     description: Actual version of K3s detected and used.
     value: ${{ steps.main.outputs.k3s-version }}