ci: switch to actions (#234)

- closes #89

Reviewed-on: https://codeberg.org/forgejo-contrib/forgejo-helm/pulls/234
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-committed-by: Michael Kriese <michael.kriese@visualon.de>

.forgejo/actions/setup-docker/action.yml

@@ -0,0 +1,26 @@
+# action.yml
+name: setup-docker
+description: 'setup docker'
+
+runs:
+  using: 'composite'
+  steps:
+    - shell: bash
+      name: create cache
+      run: |
+        install -m 0755 -d /etc/apt/keyrings
+        curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+        chmod a+r /etc/apt/keyrings/docker.gpg
+        echo \
+          "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
+          $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+          tee /etc/apt/sources.list.d/docker.list > /dev/null
+        apt-get update -qq
+        apt-get  -q install -qq \
+          containerd.io \
+          docker-ce \
+          docker-ce-cli \
+          ;
+
+    - shell: bash
+      run: docker info