.github/scripts/*.sh: fix handling \r\n in JSON

In dash echo (ubuntu-22 runner) \n and \r are interpreted which causes
fail of subsequent jq with error:
```
parse error: Invalid string: control characters from U+0000 through U+001F must be escaped at line 258, column 394
```

POSIX actually requires that for XSI-conformant systems.

Author: MartinPulec

.github/scripts/delete-asset.sh

@@ -5,13 +5,13 @@
 TAG_NAME=${1?}
 PATTERN=${2?}
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
-RELEASE_ID=$(echo "$JSON" | jq -r '.id')
+RELEASE_ID=$(printf '%s' "$JSON" | jq -r '.id')
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID/assets $GITHUB_TOKEN array)
-LEN=$(echo "$JSON" | jq length)
+LEN=$(printf '%s' "$JSON" | jq length)
 for n in `seq 0 $(($LEN-1))`; do
-        NAME=$(echo "$JSON" | jq -r '.['$n'].name')
+        NAME=$(printf '%s' "$JSON" | jq -r '.['$n'].name')
         if expr "$NAME" : "$PATTERN$"; then
-                ID=$(echo "$JSON" | jq '.['$n'].id')
+                ID=$(printf '%s' "$JSON" | jq '.['$n'].id')
                 TMPNAME=$(mktemp)
                 STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X DELETE "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/assets/$ID" -w %{http_code} -o $TMPNAME)
                 JSON=$(cat $TMPNAME)

.github/scripts/json-common.sh

@@ -1,21 +1,20 @@
 check_errors() {
-        printf '%s' "$1" | busybox nc x0.at 9999
         TYPE=$(printf '%s' "$1" | jq -r type)
         if [ "$TYPE" != object ]; then
                 return
         fi
-        ERRORS=$(echo "$1" | jq -r '.errors')
+        ERRORS=$(printf '%s' "$1" | jq -r '.errors')
         if [ "$ERRORS" != null ]; then
                 echo $ERRORS >&2
                 exit 1
         fi
 }
 
 check_type() {
-        TYPE=$(echo "$1" | jq -r type)
+        TYPE=$(printf '%s' "$1" | jq -r type)
         if [ "$TYPE" != "$2" ]; then
                 echo "Wrong JSON type - expected $2, got $TYPE" >&2
-                echo "JSON: $JSON" >&2
+                printf '%s' "JSON: $JSON" >&2
                 exit 1
         fi
 }
@@ -31,13 +30,13 @@ fetch_json() {
         rm $TMPNAM
         if [ $STATUS -ne 200 ]; then
                 echo "HTTP error code $STATUS" >&2
-                echo "JSON: $JSON" >&2
+                printf '%s' "JSON: $JSON" >&2
         fi
         check_errors "$JSON"
         if [ -n ${3-""} ]; then
                 check_type "$JSON" $3
         fi
-        echo "$JSON"
+        printf '%s' "$JSON"
 }
 
 ## @brief Checks HTTP error code for success
@@ -47,7 +46,7 @@ check_status() {
         if [ $1 -lt 200 -o $1 -ge 300 ]; then
                 echo "Wrong response status $STATUS!" >&2
                 if [ -n ${2-""} ]; then
-                        echo "JSON: $JSON" >&2
+                        printf '%s' "JSON: $JSON" >&2
                 fi
                 exit 1
         fi

.github/scripts/upload-asset.sh

@@ -8,7 +8,7 @@ CONTENT_TYPE=${3?}
 LABEL=$(echo "${4?}" | sed 's/ /%20/g')
 
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
-UPLOAD_URL=$(echo "$JSON" | jq -r .upload_url | sed "s/{.*}//")
+UPLOAD_URL=$(printf '%s' "$JSON" | jq -r .upload_url | sed "s/{.*}//")
 
 TMPNAME=$(mktemp)
 STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -H "Content-Type: $CONTENT_TYPE" -X POST "$UPLOAD_URL?name=$FILE&label=$LABEL" -T $FILE -w %{http_code} -o $TMPNAME)