Remvoe --method option from doc for required arg

Signed-off-by: Ivan Font <ifont@redhat.com>

README.model_signing.md

@@ -69,13 +69,13 @@ $ source .venv/bin/activate
 ## Sign
 
 ```bash
-(.venv) $ python3 sign.py --model_path ${MODEL_PATH} --sig_out ${SIG_PATH} --method {private-key, pki, sigstore} {additional parameters depending on method}
+(.venv) $ python3 sign.py --model_path ${MODEL_PATH} --sig_out ${SIG_PATH} {private-key, pki, sigstore} {additional parameters depending on method}
 ```
 
 ## Verify
 
 ```bash
-(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ${SIG_PATH} --method {private-key, pki, sigstore} {additional parameters depending on method}
+(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ${SIG_PATH} {private-key, pki, sigstore} {additional parameters depending on method}
 ```
 
 ### Examples
@@ -89,10 +89,10 @@ $ openssl ecparam -name secp256k1 -genkey -noout -out ec-secp256k1-priv-key.pem
 $ openssl ec -in ec-secp256k1-priv-key.pem -pubout > ec-secp256k1-pub-key.pem
 $ source .venv/bin/activate
 # SIGN
-(.venv) $ python3 sign.py --model_path ${MODEL_PATH} --sig_out ${SIG_PATH} --method private-key --private-key ec-secp256k1-priv-key.pem
+(.venv) $ python3 sign.py --model_path ${MODEL_PATH} --sig_out ${SIG_PATH} private-key --private-key ec-secp256k1-priv-key.pem
 ...
 #VERIFY
-(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ${SIG_PATH} --method private-key --public-key ec-secp256k1-pub-key.pem
+(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ${SIG_PATH} private-key --public-key ec-secp256k1-pub-key.pem
 ...
 ```
 
@@ -113,7 +113,7 @@ $ PRIVATE_KEY='/path/to/private_key'
 # SIGN
 (.venv) $ python3 sign.py --model_path ${MODEL_PATH} \
     --sig_path ${SIG_PATH} \
-    --method pki \
+    pki \
     --private-key ${PRIVATE_KEY} \
     --signing_cert ${SIGNING_CERT} \
     [--cert_chain ${CERT_CHAIN}]
@@ -122,7 +122,7 @@ $ PRIVATE_KEY='/path/to/private_key'
 $ ROOT_CERTS='/path/to/root/certs'
 (.venv) $ python3 verify.py --model_path ${MODEL_PATH} \
     --sig_path ${SIG_PATH} \
-    --method pki \
+    pki \
     --root_certs ${ROOT_CERTS}
 ...
 ```
@@ -132,10 +132,10 @@ $ ROOT_CERTS='/path/to/root/certs'
 ```bash
 $ MODEL_PATH='/path/to/your/model'
 # SIGN
-(.venv) $ python3 sign.py --model_path ${MODEL_PATH} --method sigstore
+(.venv) $ python3 sign.py --model_path ${MODEL_PATH} sigstore
 ...
 #VERIFY
-(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ./model.sig --method sigstore --identity name@example.com --identity-provider https://accounts.example.com
+(.venv) $ python3 verify.py --model_path ${MODEL_PATH} --sig_path ./model.sig sigstore --identity name@example.com --identity-provider https://accounts.example.com
 ...
 ```
 
@@ -172,9 +172,9 @@ sig_path=model.sig
 wget "https://tfhub.dev/google/bertseq2seq/bert24_en_de/1?tf-hub-format=compressed" -O "${model_path}".tgz
 mkdir -p "${model_path}"
 cd "${model_path}" && tar xvzf ../"${model_path}".tgz && rm ../"${model_path}".tgz && cd -
-python3 sign.py --model_path "${model_path}" --method sigstore
+python3 sign.py --model_path "${model_path}" sigstore
 python3 verify.py --model_path "${model_path}" --sig_path ${sig_path} \
-    --method sigstore \
+    sigstore \
     --identity-provider https://accounts.google.com \
     --identity myemail@gmail.com
 ```
@@ -196,7 +196,7 @@ sig_path=model.sig
 git clone --depth=1 "https://huggingface.co/${model_name}" && rm -rf "${model_name}"/.git
 python3 sign.py --model_path "${model_path}"
 python3 verify.py --model_path "${model_path}" --sig_path ${sig_path} \
-    --method sigstore \
+    sigstore \
     --identity-provider https://accounts.google.com \
     --identity myemail@gmail.com
 ```
@@ -210,7 +210,7 @@ sig_path=model.sig
 git clone --depth=1 "https://huggingface.co/${model_name}" && rm -rf "${model_name}"/.git
 python3 sign.py --model_path "${model_path}"
 python3 verify.py --model_path "${model_path}" --sig_path ${sig_path} \
-    --method sigstore \
+    sigstore \
     --identity-provider https://accounts.google.com \
     --identity myemail@gmail.com
 ```
@@ -226,7 +226,7 @@ mkdir -p "${model_path}"
 cd "${model_path}" && unzip ../"${model_path}".zip && rm ../"${model_path}".zip && shopt -s dotglob && mv YOLOP-main/* . && shopt -u dotglob && rmdir YOLOP-main/ && cd -
 python3 sign.py --model_path "${model_path}"
 python3 verify.py --model_path "${model_path}" --sig_path ${sig_path} \
-    --method sigstore \
+    sigstore \
     --identity-provider https://accounts.google.com \
     --identity myemail@gmail.com
 ```
@@ -240,7 +240,7 @@ sig_path=model.sig
 wget "https://github.com/onnx/models/raw/main/text/machine_comprehension/roberta/model/${model_name}.onnx"
 python3 sign.py --model_path "${model_path}"
 python3 verify.py --model_path "${model_path}" --sig_path ${sig_path} \
-    --method sigstore \
+    sigstore \
     --identity-provider https://accounts.google.com \
     --identity myemail@gmail.com
 ```