Add a github action for sops

If implemented, this code will enable flux packages to use this action to run sops
commands.

Signed-off-by: Soule BA <[email protected]>

.github/workflows/actions.yaml

@@ -30,6 +30,7 @@ jobs:
       - uses: ./actions/kustomize
       - uses: ./actions/helm
       - uses: ./actions/kubebuilder
+      - uses: ./actions/sops
       - uses: ./actions/sbom
         with:
           image: ghcr.io/fluxcd/kustomize-controller:v0.19.1

actions/sops/action.yaml

@@ -0,0 +1,25 @@
+name: Setup SOPS
+description: A GitHub Action for running sops commands
+author: Soule BA
+branding:
+  color: blue
+  icon: command
+inputs:
+  version:
+    description: "strict semver"
+    required: true
+    default: "3.7.1"
+runs:
+  using: composite
+  steps:
+    - name: "Download and copy the binary to /usr/local/bin"
+      shell: bash
+      run: |
+        VERSION=${{ inputs.version }}
+        REPO_URL=https://github.com/mozilla/sops/releases/download
+        BIN_URL="${REPO_URL}/v${VERSION}/sops-v${VERSION}.linux"
+        curl -fL --no-progress-meter ${BIN_URL} -o /tmp/sops
+        chmod +x /tmp/sops
+        sudo mv /tmp/sops /usr/local/bin
+        which sops
+        sops --version