Add acceptance tests for gh variable

acceptance/testdata/variable/variable-org.txtar

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+# Prepare organization variable, GitHub Actions uppercases names
+env2upper ORG_VARIABLE_NAME=$RANDOM_STRING
+
+# Confirm organization variable does not exist, will fail admin:org scope missing
+! exec gh variable get $ORG_VARIABLE_NAME --org $ORG
+stderr 'variable .+ was not found'
+
+# Create an organization variable
+exec gh variable set $ORG_VARIABLE_NAME --org $ORG --body 'just an org variable'
+
+# Defer organization variable cleanup
+defer gh variable delete $ORG_VARIABLE_NAME --org $ORG
+
+# Confirm organization variable exists
+exec gh variable list --org $ORG
+stdout $ORG_VARIABLE_NAME
+
+# Verify repository environment variable can be retrieved
+exec gh variable get $ORG_VARIABLE_NAME --org $ORG
+stdout 'just an org variable'

acceptance/testdata/variable/variable-repo-env.txtar

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+# Force GitHub CLI to treat testscript as TTY
+env GH_FORCE_TTY=80
+env REPO=$SCRIPT_NAME-$RANDOM_STRING
+
+# Create a repository where the variable will be registered
+exec gh repo create $ORG/$REPO --add-readme --private
+
+# Defer repo cleanup
+defer gh repo delete --yes $ORG/$REPO
+
+# Clone the repo
+exec gh repo clone $ORG/$REPO
+cd $REPO
+
+# Create a repository environment, will fail if organization does not have environment support
+exec gh api /repos/$ORG/$REPO/environments/testscripts -X PUT --jq '.name'
+stdout 'testscripts'
+
+# Verify no repository environment variables exist
+exec gh variable list --env testscripts
+stderr 'no variables found'
+
+# Create a repository environment variable
+exec gh variable set TESTSCRIPTS_ENV --env testscripts --body 'just a repo env variable'
+stdout 'Created variable TESTSCRIPTS_ENV for'
+
+# Verify new repository environment variable exists
+exec gh variable list --env testscripts
+stdout 'TESTSCRIPTS_ENV\s+just a repo env variable\s+less than a minute ago'
+
+# Verify repository environment variable can be retrieved
+exec gh variable get TESTSCRIPTS_ENV --env testscripts
+stdout 'just a repo env variable'

acceptance/testdata/variable/variable-repo.txtar

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+# Setup environment variables to force TTY
+env GH_FORCE_TTY=80
+env REPO=$SCRIPT_NAME-$RANDOM_STRING
+
+# Create a repository where the variable will be registered
+exec gh repo create $ORG/$REPO --add-readme --private
+
+# Defer repo cleanup
+defer gh repo delete --yes $ORG/$REPO
+
+# Clone the repo
+exec gh repo clone $ORG/$REPO
+cd $REPO
+
+# Verify no repository variables exist
+exec gh variable list
+stderr 'no variables found'
+
+# Create a repository variable
+exec gh variable set TESTSCRIPTS --body 'just a repo variable'
+stdout 'Created variable TESTSCRIPTS for'
+
+# Verify new repository variable exists
+exec gh variable list
+stdout 'TESTSCRIPTS\s+just a repo variable\s+less than a minute ago'
+
+# Verify repository variable can be retrieved
+exec gh variable get TESTSCRIPTS
+stdout 'just a repo variable'