Use tmp file to avoid problems with single quotes

Closes #116

Signed-off-by: Jeroen Knoops <[email protected]>

action.yaml

@@ -30,8 +30,13 @@ runs:
       id: compose-args
       shell: bash
       run: |
-        encoded_github="$(echo '${{ inputs.github_context }}' | base64 -w 0)"
-        encoded_runner="$(echo '${{ inputs.runner_context }}' | base64 -w 0)"
+        echo "${{ inputs.github_context }}" > github_context.json
+        encoded_github="$(cat github_context.json | base64 -w 0)"
+        rm github_context.json
+
+        echo "${{ inputs.run_context }}" > runner_context.json
+        encoded_runner="$(cat runner_context.json | base64 -w 0)"
+        rm runner_context.json
 
         args=(${{ inputs.command }})
         args+=(${{ inputs.subcommand }})