feat: add nix for formatting

Also adds CI tests!

retrieve-old-report.sh

@@ -3,59 +3,59 @@
 . "${GITHUB_ACTION_PATH}/utils.sh"
 
 repo_info() {
-	curl -X GET \
-		-H "Authorization: token $GITHUB_TOKEN" \
-		-H 'accept: application/json' \
-		"$GITHUB_API_URL/repos/$GITHUB_REPOSITORY"
+  curl -X GET \
+    -H "Authorization: token $GITHUB_TOKEN" \
+    -H 'accept: application/json' \
+    "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY"
 }
 
 in_private_repo() {
-	test "$(repo_info | jq --raw-output '.private')" = 'true'
+  test "$(repo_info | jq --raw-output '.private')" = 'true'
 }
 
 default_branch() {
-	repo_info | jq --raw-output '.default_branch'
+  repo_info | jq --raw-output '.default_branch'
 }
 
 # USAGE: base_report_url <BASE_BRANCH>
 base_report_url() {
-	curl -X 'GET' \
-		"$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/actions/tasks" \
-		-H "Authorization: token $GITHUB_TOKEN" \
-		-H 'accept: application/json' |
-		jq --raw-output \
-			--arg name "$JOB_NAME" \
-			--arg head_branch "$1" \
-			'[.workflow_runs[] | select(.name == $name and .head_branch == $head_branch)] | first | .url'
+  curl -X 'GET' \
+    "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/actions/tasks" \
+    -H "Authorization: token $GITHUB_TOKEN" \
+    -H 'accept: application/json' |
+    jq --raw-output \
+      --arg name "$JOB_NAME" \
+      --arg head_branch "$1" \
+      '[.workflow_runs[] | select(.name == $name and .head_branch == $head_branch)] | first | .url'
 }
 
 # USAGE: has_report <REPORT_URL>
 has_report() {
-	http_code=$(curl -X 'GET' -o /dev/null --silent -Iw '%{http_code}' \
-		"$1" -H "Authorization: token $GITHUB_TOKEN")
-	log "Got code $http_code for $1"
-	test "$http_code" = '200'
+  http_code=$(curl -X 'GET' -o /dev/null --silent -Iw '%{http_code}' \
+    "$1" -H "Authorization: token $GITHUB_TOKEN")
+  log "Got code $http_code for $1"
+  test "$http_code" = '200'
 }
 
 # If a base branch is not provided, use the default branch
 base_branch=${BASE_BRANCH:-$(default_branch)}
 
 if [ "$(in_private_repo)" != 'true' ] && [ "$JOB_NAME" ]; then
-	url=$(base_report_url "$base_branch")
+  url=$(base_report_url "$base_branch")
 
-	log "Found previous run at: $url"
-	report_url="$url/artifacts/$ARTIFACT_NAME"
+  log "Found previous run at: $url"
+  report_url="$url/artifacts/$ARTIFACT_NAME"
 
-	if has_report "$report_url"; then
-		log 'Found previous report, downloading...'
-		curl -X 'GET' \
-			"$report_url" \
-			-H "Authorization: token $GITHUB_TOKEN" |
-			gunzip >old-report.json
-		log "Reporting on sizes and comparing to sizes in $base_branch"
-		exit 0
-	fi
-	error "Failed to find previous report, expected at: $report_url"
+  if has_report "$report_url"; then
+    log 'Found previous report, downloading...'
+    curl -X 'GET' \
+      "$report_url" \
+      -H "Authorization: token $GITHUB_TOKEN" |
+      gunzip >old-report.json
+    log "Reporting on sizes and comparing to sizes in $base_branch"
+    exit 0
+  fi
+  error "Failed to find previous report, expected at: $report_url"
 fi
 
 warn "Couldn't retrieve old report:"
@@ -69,9 +69,9 @@ error "Falling back to slow method (checkout $base_branch and generate the repor
 old=$(mktemp -d)
 group "Download files from $base_branch"
 curl -X 'GET' \
-	"$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/archive/$base_branch.tar.gz" \
-	-H "Authorization: token $GITHUB_TOKEN" |
-	tar -zvx --strip-components=1 -C "$old"
+  "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/archive/$base_branch.tar.gz" \
+  -H "Authorization: token $GITHUB_TOKEN" |
+  tar -zvx --strip-components=1 -C "$old"
 endgroup
 
 (cd "$old" && "$GITHUB_ACTION_PATH/create-report.sh") >old-report.json