Use $RUNNER_TEMP when TF_CLI_CONFIG_FILE not in use #270
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If you don't specify the TF_CLI_CONFIG_FILE environment variable, the default config is written to $HOME directory, which could theoretically be shared by multiple runners when using self-hosted runners. When TF_CLI_CONFIG_FILE is _not_ in use, I replaced the usage of $HOME with the directory $RUNNER_TEMP, whose setup/cleanup is managed by the runner framework and exported a TF_CLI_CONFIG_FILE.
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I suspect that if you don't specify the TF_CLI_CONFIG_FILE environment variable, the default config that is written to $HOME directory could be overwritten/leaked to multiple runners when using non-ephemeral, self-hosted runners.
When TF_CLI_CONFIG_FILE is not in use, I replaced the usage of $HOME with the directory $RUNNER_TEMP, whose setup/cleanup is managed by the runner framework and exported a TF_CLI_CONFIG_FILE to be used by terraform in subsequent steps.
Fixes #269